Adds .gitea/workflows/docker-build.yml: a test-gated, amd64-only Docker
build that pushes the fork's own image to the Gitea container registry
(192.168.1.95:3000). The .NET test job gates the image build; the build
job stamps INFO_VERSION from git, uses buildx registry layer caching, and
smoke-tests that the built image boots before finishing.
Tagging:
- push to main -> :latest + :<short-sha> (test image; prod untouched)
- push tag v* -> :prod + :<version> + :<short-sha> (prod release)
Updates docker/Dockerfile to pull the FFmpeg base image from our Gitea
registry (192.168.1.95:3000/timothy/ersatztv-ffmpeg:7.1.1) instead of the
archived upstream ghcr.io image.
Removes the upstream .github/workflows/* — they target GHCR/DockerHub and
Azure/Apple signing secrets we don't have, call reusable workflows at dead
ersatztv/ersatztv@main paths, and were running as noise (incl. a daily
stale-issue cron) on the Gitea runner. Upstream is archived, so there are
no future merges to preserve them for.
Refs #4, #3.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>