Minimal setup to pull the HCD image for integration testing

.github/workflows/test-hcd.yaml

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+name: Run integration tests on HCD + Data API
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  id-token: write          # required for OIDC
+  contents: read           # required for actions/checkout if you use it
+
+env:
+  AWS_ECR_REGION: ${{ secrets.AWS_ECR_REGION }}
+  AWS_ECR_ACCOUNT_ID: ${{ secrets.AWS_ECR_ACCOUNT_ID }}
+  AWS_ECR_ROLE_NAME: ${{ secrets.AWS_ECR_ROLE_NAME }}
+  AWS_ECR_REPOSITORY: ${{ secrets.AWS_ECR_REPOSITORY }}
+  AWS_ECR_REGISTRY: ${{ secrets.AWS_ECR_REGISTRY }}
+  AWS_ECR_HCD_IMAGE_TAG: "1.2.3"
+
+jobs:
+  test:
+    env:
+      # template: some might be needed (OpenAI API Key, "reranking API Key" ?)
+      VAR_NAME: ${{ secrets.VAR_NAME }}
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Configure AWS credentials from OIDC
+      uses: aws-actions/configure-aws-credentials@v4
+      with:
+        role-to-assume: arn:aws:iam::${{ env.AWS_ECR_ACCOUNT_ID }}:role/${{ env.AWS_ECR_ROLE_NAME }}
+        aws-region: ${{ env.AWS_ECR_REGION }}
+
+    - name: Login to Amazon ECR
+      uses: aws-actions/amazon-ecr-login@v2
+
+    - name: Pull the image
+      run: |
+        docker pull $AWS_ECR_REGISTRY/$AWS_ECR_REPOSITORY:$AWS_ECR_HCD_IMAGE_TAG
+
+    # TODO maybe replace this step with 'testcontainers' ?
+    - name: Start HCD + Data API
+      run: |
+        docker compose up -d
+      working-directory: docker-compose
+
+    - name: A few seconds for the Data API to fully start
+      run: sleep 10
+
+    # TODO remove this mock step
+    - name: Issue a request to the Data API
+      run: |
+        curl -XPOST \
+        http://localhost:8181/v1/ \
+        -H "token: Cassandra:Y2Fzc2FuZHJh:Y2Fzc2FuZHJh" \
+        -H "Content-Type: application/json" \
+        -d '{"findKeyspaces": {}}'
+
+    # TODO set up runtime, dependencies, whatever is needed to run the c# tests
+
+    # TODO run the tests