remove postgres setup

.github/workflows/ci_dbt_core_testing.yml

@@ -38,6 +38,11 @@ on:
 
 permissions: read-all
 
+# will cancel previous workflows triggered by the same event and for the same ref for PRs or same SHA otherwise
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ contains(github.event_name, 'pull_request') && github.event.pull_request.head.ref || github.sha }}
+  cancel-in-progress: true
+
 defaults:
   run:
     shell: bash
@@ -101,17 +106,6 @@ jobs:
         with:
           python-version: "3.11"
 
-      - name: "Where are we?"
-        run: ls -al
-
-      - name: "Cat action"
-        run: cat ./.github/actions/setup-postgres-linux/action.yml
-
-      # TODO: do we want to run other os versions?
-      - name: Set up postgres (linux)
-        if: runner.os == 'Linux'
-        uses: ./.github/actions/setup-postgres-linux
-
       - name: "Install python tools & dependencies"
         run: |
           python -m pip install --user --upgrade pip