docker stuff

.github/workflows/ci.yaml

@@ -0,0 +1,29 @@
+name: "CI"
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        service: ["api", "tasks", "websocket"]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - run: |
+          docker build . \
+            --build-arg SERVICE=${{ matrix.service }} \
+            -t ghcr.io/${{ github.repository }}/${{ matrix.service }}:${{ github.sha }}
+      - run: |
+          docker tag ghcr.io/${{ github.repository }}/${{ matrix.service }}:${{ github.sha }} \
+            ghcr.io/${{ github.repository }}/${{ matrix.service }}:latest
+        if: github.ref == 'refs/heads/main'
+      - run: |
+          docker push ghcr.io/${{ github.repository }}/${{ matrix.service }}