break apart action into two steps, move script into scripts folder

.github/actions/setup-postgres-linux/action.yml

@@ -1,10 +1,15 @@
-name: "Set up postgres (linux)"
-description: "Set up postgres service on linux vm for dbt integration tests"
+name: Set up postgres (linux)
+description: Set up and configure postgres database on linux for integration tests
+
 runs:
-  using: "composite"
+  using: composite
   steps:
-    - shell: bash
-      run: |
-        sudo systemctl start postgresql.service
-        pg_isready
-        sudo -u postgres bash ${{ github.action_path }}/setup_db.sh
+
+    - name: Start postgres service
+      run: sudo systemctl start postgresql.service && pg_isready
+      shell: bash
+
+    - name: Configure database
+      shell: bash
+      run: ./setup_postgres_linux.sh
+      working-directory: ./.github/scripts