Don't fail initialize-user job when Dashboard app is already configured

While debuging #63 (closed) I noticed that the dashboard-initialize-user job didn't finish because it breaks on the flask cli app create dashboard Dashboard; step:

❯ kc -n stackspin logs dashboard-initialize-user-smwd5
INFO  [alembic.runtime.migration] Context impl MySQLImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade  -> 27761560bbcb, empty message
INFO  [alembic.runtime.migration] Running upgrade 27761560bbcb -> 5f462d2d9d25, convert role column to table
INFO  [alembic.runtime.migration] Running upgrade 5f462d2d9d25 -> b514cca2d47b, update apps and add 'user' and 'no access' role
[2022-06-16 10:49:49,463] INFO in cli: Creating user with email: (admin@1290-have-to-login-almost-daily.ci.stackspin.net)
[2022-06-16 10:49:55,563] INFO in cli: Setting password for: (admin@1290-have-to-login-almost-daily.ci.stackspin.net)
[2022-06-16 10:49:57,048] INFO in cli: Success setting password
[2022-06-16 10:49:58,153] INFO in cli: Creating app definition: Dashboard (dashboard)
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1819, in _execute_context
    self.dialect.do_execute(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 732, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/local/lib/python3.10/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.10/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 548, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 775, in _read_query_result
    result.read()
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 1156, in read
    first_packet = self.connection._read_packet()
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 725, in _read_packet
    packet.raise_for_error()
  File "/usr/local/lib/python3.10/site-packages/pymysql/protocol.py", line 221, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.10/site-packages/pymysql/err.py", line 143, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.IntegrityError: (1062, "Duplicate entry 'dashboard' for key 'slug'")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/flask", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.10/site-packages/flask/cli.py", line 995, in main
    cli.main(args=sys.argv[1:])
  File "/usr/local/lib/python3.10/site-packages/flask/cli.py", line 601, in main
    return super().main(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/flask/cli.py", line 445, in decorator
    return __ctx.invoke(f, *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/app/cliapp/cliapp/cli.py", line 61, in create_app
    db.session.commit()
  File "<string>", line 2, in commit
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 1451, in commit
    self._transaction.commit(_to_root=self.future)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 829, in commit
    self._prepare_impl()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 808, in _prepare_impl
    self.session.flush()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 3383, in flush
    self._flush(objects)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 3522, in _flush
    with util.safe_reraise():
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
    raise exception
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/session.py", line 3483, in _flush
    flush_context.execute()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/unitofwork.py", line 456, in execute
    rec.execute(self)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/unitofwork.py", line 630, in execute
    util.preloaded.orm_persistence.save_obj(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/persistence.py", line 245, in save_obj
    _emit_insert_statements(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/orm/persistence.py", line 1238, in _emit_insert_statements
    result = connection._execute_20(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1631, in _execute_20
    return meth(self, args_10style, kwargs_10style, execution_options)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/sql/elements.py", line 325, in _execute_on_connection
    return connection._execute_clauseelement(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1498, in _execute_clauseelement
    ret = self._execute_context(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1862, in _execute_context
    self._handle_dbapi_exception(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 2043, in _handle_dbapi_exception
    util.raise_(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
    raise exception
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1819, in _execute_context
    self.dialect.do_execute(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 732, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/local/lib/python3.10/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.10/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 548, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 775, in _read_query_result
    result.read()
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 1156, in read
    first_packet = self.connection._read_packet()
  File "/usr/local/lib/python3.10/site-packages/pymysql/connections.py", line 725, in _read_packet
    packet.raise_for_error()
  File "/usr/local/lib/python3.10/site-packages/pymysql/protocol.py", line 221, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.10/site-packages/pymysql/err.py", line 143, in raise_mysql_exception
    raise errorclass(errno, errval)
sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError) (1062, "Duplicate entry 'dashboard' for key 'slug'")
[SQL: INSERT INTO app (name, slug) VALUES (%(name)s, %(slug)s)]
[parameters: {'name': 'Dashboard', 'slug': 'dashboard'}]
(Background on this error at: https://sqlalche.me/e/14/gkpj)
[2022-06-16 10:49:59,202] INFO in cli: Assiging role admin to admin@1290-have-to-login-almost-daily.ci.stackspin.net for app dashboard

The flask cli app should handle this error gracefully when the app already exists.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information