Fixes: #927

Closes: #840

This reverts commit 1978d270.

See https://open.greenhost.net/openappstack/openappstack/-/issues/879
for details

add unattended-upgrades to its own job so it does not interfere with apt installations in the pipeline

Closes: #709

Closes: #792

168h produced the following error:

    invalid schema config: boltdb-shipper works best with 24h periodic index config.
    Either add a new config with future date set to 24h to retain the existing index or
    change the existing config to use 24h period.

Closes: #790

Fixes: #780

TRIGGER_JOBS=enable-rocketchat