feat: cronjob to remove old rdev stacks (#4008)

.github/workflows/clean_happy_rdev.yml

@@ -0,0 +1,28 @@
+name: Clean up stale happy stacks every hour
+
+on:
+  schedule:
+    # Runs "every 55th minute" (see https://crontab.guru)
+    - cron: "55 * * * *"
+jobs:
+  build:
+    name: Clean happy stacks
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY }}
+          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          aws-region: us-west-2
+          role-to-assume: ${{ secrets.AWS_ROLE_TO_ASSUME }}
+          role-duration-seconds: 900
+          role-session-name: HappyCleanupSingleCellDPRdevStacks
+      - name: Clean up stale happy stacks
+        uses: chanzuckerberg/github-actions/.github/actions/happy-cleanup@happy-cleanup-v1.1.0
+        with:
+          tfe_token: ${{secrets.TFE_TOKEN}}
+          # the default stale period to delete a stack is 2 weeks
+          # override like this:
+          #time: 3 weeks
+          #time: 2 days