docker-buildlisted

# Purpose Build and push Docker images for the project's services to the cloud container registry (see `.claude/project.json` → `cloud.provider`). Covers multi-arch builds (e.g., ARM64 for a device/edge service on a Raspberry Pi, AMD64 for the main web app), tagging conventions, and registry authentication. This skill handles image creation only; deploying the image is handled by `deployment`. Placeholders: `<mainApp>` = `project.json → mainApp`; `<device>` = `project.json → device` (the device/edge service, if the project has one). # When to use this skill (triggers) - Building a Docker image for the main app or the device service - Pushing a built image to the cloud container registry - Setting up Docker buildx for multi-architecture builds - Debugging image build failures (build context, layer caching, platform mismatch) # When NOT to use this skill (anti-triggers) - Deploying an image to the runtime environment -- use `deployment` - Editing deployment config templates or values files -- use `deployment` - Editing a Dockerfile without running a build -- use `code-quality` for review - Pushing to the production registry from a local dev machine without CI -- stop and escalate - Tests have not passed for the code being built -- build gate not met, do not proceed # Required environment (Runtime: .claude/skills/docker-build/SKILL.md) - Tools/libraries: `docker` (with buildx plugin), the cloud provider's CLI (for registry auth) - Environment variable: `IMAGE_REGISTRY` -