add github actions workflow

.github/workflows/build_test.yaml

@@ -0,0 +1,78 @@
+name: Build, Test, and Publish Docker Image
+
+on: # TODO: Only run on pull request or push to main
+  push:
+    branches:
+      - henryh/setup-github_actions
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+  SERVICE_NAME: "rslearn_projects"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=sha,format=long
+            type=sha,format=short
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        id: build-push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+  test:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Compose
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y docker-compose
+
+      - name: Pull the latest image
+        run: |
+          docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+
+      - name: Run tests with Docker Compose
+        run: |
+          docker-compose -f docker-compose.test.yml up --exit-code-from tests
+        env:
+          IMAGE_TAG: ${{ github.sha }}
+
+      - name: Clean up
+        if: always()
+        run: |
+          docker-compose -f docker-compose.test.yml down