[SRE-5664] Phase 5h: Add Git and Git LFS to builder image

[itskingori]

Adds git and git-lfs to the builder image and aligns the runtime user with the checkout flow used by the builder job. The new port-control-app builder implementation needs to support repositories that depend on Git LFS, but git-sync does the checkout only and does not hydrate LFS-managed objects.

This image change provides the tooling needed for the follow-up git lfs commands that will be introduced there. It also changes the builder runtime UID/GID to 65533 to match git-sync, which keeps permissions simple across the shared workspace.

Changes

• Installs git and git-lfs in the builder image
• Updates the documented image contents to include both tools
• Changes the builder user and group UID/GID from 1001 to 65533
• Adds a 1.1.0 changelog entry for Git/Git LFS and UID/GID alignment

Testing

• docker build -t zappi-image-builder:test .
• docker run --rm zappi-image-builder:test git --version
• docker run --rm zappi-image-builder:test git lfs version
• docker run --rm zappi-image-builder:test id

Related

• https://github.com/Intellection/port-control-app/pull/78

[itskingori]

Image released: https://hub.docker.com/r/zappi/image-builder/tags?name=1.1.0