Add Ubuntu 22.04 (jammy) build image

• Adds Ubuntu 22.04 (jammy) build image
• Sorts Ubuntu image-related tasks in release date
• Dockerfile.omnibus-gitlab-jammy is identical to Dockerfile.omnibus-gitlab-focal

TODO

• We cannot use ubuntu:jammy (or ubuntu:22.04) due to the problem in !521 (merged)
  • This problem is not only relevant to jammy but also ubuntu:impish
• Ability to compile Ruby 2.7 (and 3.0) with openssl 3.0 (note: Ruby 3.1 can be compiled)
  • https://bugs.ruby-lang.org/issues/18658

Refs.

• Closes omnibus-gitlab#6793 (closed)
• Previous addition (Ubuntu 20.04 (focal): !304 (merged)

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com