fix(api): correct COPY paths in Dockerfile for monorepo build context

The api/Dockerfile used bare paths (COPY pyproject.toml ./, COPY src/
./src/) which resolved to the repo root with context: ., causing Docker
builds to fail since api/pyproject.toml and api/src/ don't exist at the
repo root.

Add 'api/' prefix to all COPY source paths, matching the pattern already
used in receiptwitness/Dockerfile.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ env:
   IMAGE_NAME: cartsnitch/cartsnitch
   AUTH_IMAGE_NAME: cartsnitch/auth
   RECEIPTWITNESS_IMAGE_NAME: cartsnitch/receiptwitness
+  API_IMAGE_NAME: cartsnitch/api
 
 jobs:
   lint:
@@ -222,9 +223,57 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
 
+  build-and-push-api:
+    runs-on: runners-cartsnitch
+    needs: [lint, test]
+    outputs:
+      calver_tag: ${{ steps.calver.outputs.version }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Generate CalVer tag
+        id: calver
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: |
+          DATE_TAG=$(date -u +%Y.%m.%d)
+          EXISTING=$(git tag -l "v${DATE_TAG}*" | sort -V | tail -1)
+          if [ -z "$EXISTING" ]; then VERSION="$DATE_TAG"
+          elif [ "$EXISTING" = "v${DATE_TAG}" ]; then VERSION="${DATE_TAG}.2"
+          else BUILD_NUM=$(echo "$EXISTING" | sed "s/v${DATE_TAG}\.//"); VERSION="${DATE_TAG}.$((BUILD_NUM + 1))"; fi
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to GHCR
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (API)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.API_IMAGE_NAME }}
+          tags: |
+            type=sha,prefix=sha-
+            type=raw,value=${{ steps.calver.outputs.version }},enable=${{ github.ref == 'refs/heads/main' }}
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
+
+      - name: Build and push API Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./api/Dockerfile
+          push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
   deploy-dev:
     runs-on: runners-cartsnitch
-    needs: [build-and-push, build-and-push-auth, build-and-push-receiptwitness]
+    needs: [build-and-push, build-and-push-auth, build-and-push-receiptwitness, build-and-push-api]
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - name: Generate GitHub App token
@@ -256,6 +305,7 @@ jobs:
           kustomize edit set image ghcr.io/cartsnitch/cartsnitch:${{ needs.build-and-push.outputs.calver_tag }}
           kustomize edit set image ghcr.io/cartsnitch/auth:${{ needs.build-and-push-auth.outputs.calver_tag }}
           kustomize edit set image ghcr.io/cartsnitch/receiptwitness:${{ needs.build-and-push-receiptwitness.outputs.calver_tag }}
+          kustomize edit set image ghcr.io/cartsnitch/api:${{ needs.build-and-push-api.outputs.calver_tag }}
 
       - name: Commit and push to infra
         run: |
@@ -263,5 +313,5 @@ jobs:
           git config user.name "cartsnitch-ci[bot]"
           git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
           git add apps/overlays/dev/kustomization.yaml
-          git commit -m "ci(dev): update cartsnitch, auth, and receiptwitness images"
+          git commit -m "ci(dev): update cartsnitch, auth, receiptwitness, and api images"
           git push origin main

api/Dockerfile

@@ -1,3 +1,5 @@
+# Stage 1: Build dependencies
+# Build context is the repo root.  Paths below are relative to the root.
 FROM python:3.12-slim AS build
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -6,18 +8,19 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
-COPY pyproject.toml ./
-COPY src/ ./src/
+COPY api/pyproject.toml ./
+COPY api/src/ ./src/
 RUN pip install --no-cache-dir --prefix=/install .
 
+# Stage 2: Production image
 FROM python:3.12-slim AS prod
 
 WORKDIR /app
 RUN adduser --system --group --uid 1000 app
 COPY --from=build /install /usr/local
-COPY src/ ./src/
-COPY alembic.ini ./
-COPY alembic/ ./alembic/
+COPY api/src/ ./src/
+COPY api/alembic.ini ./
+COPY api/alembic/ ./alembic/
 
 USER 1000
 EXPOSE 8000