Add Bullseye based images
This adds the following new images:
- bullseye-sssd
- bullseye-standalone
- jdk17-sssd-{base,web}
- php74-sssd-{base,web}
- python39-sssd-{base,web,pwb}
- ruby27-sssd-{base,web}
Notably this does not include a Go image. There were some concerns about
good practices and including them, so I feel it needs more discussion
and can be left out of the initial Bullseye release images.
Bug: T284590
Change-Id: I2e7f6b661f454a03061246bb61ec5e500297114b