cc90857cf5
Collapse Set image tag, Build Docker image, and Push image steps into a single step that computes TAG inline, eliminating the dependency on $GITHUB_OUTPUT which is not reliably available in Gitea Actions runners. Also moves registry login before the build+push step for correct ordering. Closes leeworks-agents/gitea-mobile#25 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>