add cron action to purge s3 test bucket weekly (#200)

* add cron action to purge s3 test bucket weekly

.github/workflows/weekly_cleanup.yml

@@ -0,0 +1,25 @@
+name: Weekly S3 Test Bucket Cleanup
+on:
+  schedule:
+    # every saturday at 23:59 (11:59pm)
+    - cron: "59 23 * * 6"
+
+permissions:
+  # required to retrieve AWS credentials
+  id-token: write
+
+jobs:
+  S3-Test-Cleanup:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Configure AWS credentials from Test account
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          role-to-assume: arn:aws:iam::951767375776:role/corso-testing-role
+          role-session-name: integration-testing
+          aws-region: us-east-1
+
+      - name: Delete all files in the test bucket
+        run: |
+          aws s3 rm s3://test-corso-repo-init --recursive