Add workflow to purge RDS snapshots (#947)

* Adding purge aws rds snapshots workflow

Signed-off-by: willdavsmith <willdavsmith@gmail.com>

* Adding purge aws rds snapshots workflow

Signed-off-by: willdavsmith <willdavsmith@gmail.com>

---------

Signed-off-by: willdavsmith <willdavsmith@gmail.com>

.github/scripts/purge-aws-rds-snapshots.sh

@@ -0,0 +1,23 @@
+# ------------------------------------------------------------
+# Copyright 2023 The Radius Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#    
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ------------------------------------------------------------
+
+set -xe
+
+aws rds describe-db-snapshots --query 'DBSnapshots[].DBSnapshotIdentifier' --output text > snapshots.txt
+for rds_snapshot_identifier in $(cat ./snapshots.txt)    
+do
+    aws rds delete-db-snapshot --db-snapshot-identifier $rds_snapshot_identifier
+done

.github/workflows/purge-aws-rds-snapshots.yaml

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+name: Purge AWS RDS DBInstance snapshots
+on:
+  schedule:
+    # Runs at 00:30 and 12:30
+    - cron: "30 0,12 * * *"
+jobs:
+  purge_rds_snapshots:
+    name: Purge AWS RDS DBInstance snapshots
+    runs-on: [ubuntu-latest]
+    steps:
+      - name: Purge AWS RDS DBInstance snapshots
+        run: |
+          ./.github/scripts/purge-aws-rds-snapshots.sh
+      - name: Create GitHub issue on failure
+        if: ${{ failure() }}
+        run: |
+          gh issue create --title "Purge AWS RDS DBInstance snapshots workflow failed" \
+            --body "Test failed on ${{ github.repository }}. See [workflow logs](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) for more details." \
+            --repo ${{ github.repository }}