Added a postgres container

.github/workflows/linux-postgres-cxx20.yaml

@@ -0,0 +1,39 @@
+name: linux-postgres-cxx20 
+
+on: [ pull_request, workflow_dispatch ]
+
+jobs:
+  container-job:
+    runs-on: ubuntu-24.04
+    container: node:20-bookworm-slim
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      # Performs a clean installation of all dependencies in the `package.json` file
+      # For more information, see https://docs.npmjs.com/cli/ci.html
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Connect to PostgreSQL
+        # Runs a script that creates a PostgreSQL table, populates
+        # the table with data, and then retrieves the data.
+        run: node client.js
+        # Environment variables used by the `client.js` script to create a new PostgreSQL table.
+        env:
+          # The hostname used to communicate with the PostgreSQL service container
+          POSTGRES_HOST: postgres
+          # The default PostgreSQL port
+          POSTGRES_PORT: 5432