ci: add container release workflow for GHCR

Add GitHub Actions workflow to build and publish container images to
ghcr.io/killrvideo/kv-be-python-fastapi-dataapi-table on push to main
and version tags. PRs get build-only validation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pmcfadin

.dockerignore

@@ -0,0 +1,19 @@
+.git
+.github
+.claude
+.venv
+.env
+.env.*
+__pycache__
+*.pyc
+*.pyo
+certs/
+data/
+logs/
+docs/
+scripts/
+tests/
+*.log
+.DS_Store
+.vscode
+VIDEO_DESCRIPTION_FIX.md

.github/workflows/container-release.yml

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+name: Container Release
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+    tags: ["v*"]
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to ghcr.io
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/killrvideo/kv-be-python-fastapi-dataapi-table
+          tags: |
+            type=sha,prefix=sha-
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+FROM python:3.12-slim AS builder
+
+WORKDIR /app
+
+RUN pip install --no-cache-dir poetry && \
+    poetry config virtualenvs.in-project true
+
+COPY pyproject.toml poetry.lock ./
+RUN poetry install --only main --no-root --no-interaction
+
+COPY README.md ./
+COPY app/ app/
+RUN poetry install --only main --no-interaction
+
+# ---------------------------------------------------------------------------
+
+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY --from=builder /app/.venv /app/.venv
+COPY --from=builder /app/app /app/app
+
+ENV PATH="/app/.venv/bin:$PATH" \
+    PYTHONUNBUFFERED=1
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]