wip adding docker for tests

.github/workflows/Dockerfile

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+FROM postgres:16-alpine
+
+RUN apk add --no-cache \
+    make \
+    gcc \
+    musl-dev \
+    postgresql-dev \
+    git \
+    clang \
+    llvm
+
+WORKDIR /home/postgres/snowflake
+
+COPY . /home/postgres/snowflake/
+
+RUN USE_PGXS=1 make && USE_PGXS=1 make install
+
+EXPOSE 5432
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+
+CMD ["postgres"]

.github/workflows/snowflake-docker.yml

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+name: Build and Test Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout snowflake
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ github.ref }}
+
+    - name: Set up Docker
+      uses: docker/setup-buildx-action@v2
+
+    - name: Build Docker Image
+      run: |
+        docker build --progress plain -t snowflake .
+
+    - name: Run Docker Container
+      run: |
+        docker run -d --name snowflake-container -e POSTGRES_PASSWORD=password -p 5432:5432 snowflake-test
+        sleep 5
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+
+    - name: Install dependencies
+      run: |
+        sudo apt -y update
+        sudo apt install -y postgresql-client-${{ matrix.pgver }} \
+            libpq-dev \
+            python3-dev \
+            python3-psycopg2 \
+            python3-dotenv
+
+    - name: Run Test Harness (runner.py)
+      run: |
+        python test/runner.py -c test/t/lib/${{ matrix.pgver }}config.env -s test/schedule_files/script_file -k