build: containerize the API and publish images to GHCR

Multi-stage Dockerfile (python:3.11-slim, non-root, /health healthcheck) with an entrypoint that applies alembic migrations before uvicorn, a compose file pairing the API with Postgres 16, and a CI workflow that builds multi-arch images and pushes branch/semver/sha/latest tags to ghcr.io. PR builds compile the image without pushing.
2026-08-30 11:26:25 +00:00 · 2026-07-09 20:54:27 -04:00
parent bbb01d0882
commit a0ee204cfc
5 changed files with 185 additions and 0 deletions
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+name: docker
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+env:
+  IMAGE: ghcr.io/${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Tags: branch name on branch pushes, semver on v* tags, short SHA always,
+      # `latest` only on the default branch. metadata-action lowercases the repo
+      # name (GHCR requires lowercase).
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          # PRs build (to catch Dockerfile breakage) but never push.
+          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