Update libraries and dockerfile to Debian 12

Closes #31

See merge request !11

Resolve "Better sanitization of SSH keys"

Closes #25

See merge request !10

Resolve "Update references to new gitlab url"

Closes #15

See merge request !9

Resolve "Adding ssh keys may break `authorized_keys`"

Closes #11

See merge request open/cryptops!7

Resolve "Switch to docker for build environment"

Closes #12

See merge request open/cryptops!8

Resolve "Add notes on what's *not* encrypted to documentation"

Closes #9

See merge request open/cryptops!6

Resolve "Automatically deploy documentation to cryptops.com"

Closes #10

See merge request open/cryptops!4

Resolve "Add link to 34C3 presentation to cryptops documentation"

Closes #8

See merge request open/cryptops!5

Resolve "Write API documentation"

Closes #2

See merge request open/cryptops!3