add delete old cloud formation stack workflow

.github/workflows/delete_old_cloudformation_stacks.yml

@@ -0,0 +1,38 @@
+name: 'Delete old cloudformation stacks'
+
+# Controls when the action will run - in this case triggered manually
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "combine-prs"
+  delete-old-cloudformation-stacks:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    permissions:
+        id-token: write
+        contents: read
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - name: Checkout local github scripts
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ env.BRANCH_NAME }}
+          sparse-checkout: |
+            .github/scripts
+
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          aws-region: eu-west-2
+          role-to-assume: ${{ secrets.DEV_CLOUD_FORMATION_DEPLOY_ROLE }}
+          role-session-name: github-actions
+
+      - name: delete stacks
+        shell: bash
+        working-directory: .github/scripts
+        run: ./delete_stacks.sh