Add purge job for bicep artifacts (#8281)

# Description

This adds a purge job for test bicep artifacts. It will delete any
manifests that are older than 90 days. This only applies to the test
schemas uploaded as part of PRs, not any major release versions of
Radius or AWS bicep types.

A successful test run can be found here:
https://github.com/radius-project/radius/actions/runs/12939411131

## Type of change

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Fixes: #issue_number

## Contributor checklist
Please verify that the PR meets the following requirements, where
applicable:

- [ ] An overview of proposed schema changes is included in a linked
GitHub issue.
- [ ] A design document PR is created in the [design-notes
repository](https://github.com/radius-project/design-notes/), if new
APIs are being introduced.
- [ ] If applicable, design document has been reviewed and approved by
Radius maintainers/approvers.
- [ ] A PR for the [samples
repository](https://github.com/radius-project/samples) is created, if
existing samples are affected by the changes in this PR.
- [ ] A PR for the [documentation
repository](https://github.com/radius-project/docs) is created, if the
changes in this PR affect the documentation or any user facing updates
are made.
- [ ] A PR for the [recipes
repository](https://github.com/radius-project/recipes) is created, if
existing recipes are affected by the changes in this PR.

---------

Signed-off-by: sk593 <[email protected]>

.github/workflows/purge-azure-test-resources.yaml

@@ -91,9 +91,36 @@ jobs:
               az group delete --resource-group $line --yes --verbose --no-wait
           done
 
+  purge_bicep_types:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Azure
+        uses: azure/login@v2
+        with:
+          client-id: ${{ secrets.BICEPTYPES_CLIENT_ID }}
+          tenant-id: ${{ secrets.BICEPTYPES_TENANT_ID }}
+          subscription-id: ${{ secrets.BICEPTYPES_SUBSCRIPTION_ID }}
+
+      # Delete Bicep types that are older than 30 days from the test registry 
+      - name: Delete test bicep type manifests
+        run: |
+          REPO_NAME="test/radius"
+          REGISTRY_NAME="biceptypes"
+          DATE="$(date -d '30 days ago' +%Y-%m-%d)"
+
+          az acr manifest list-metadata \
+            -r $REGISTRY_NAME \
+            -n $REPO_NAME \
+            --query "[?lastUpdateTime<='$DATE'].digest" \
+            -o tsv | while read DIGEST; do 
+              az acr manifest delete \
+                -n $REPO_NAME@$DIGEST \
+                -r $REGISTRY_NAME --yes
+          done
+
   create_issue_on_failure:
     name: Create issue for failing purge Azure test resources run
-    needs: [purge_azure_resources]
+    needs: [purge_azure_resources, purge_bicep_types]
     runs-on: ubuntu-latest
     if: ${{ failure() && github.event_name != 'workflow_dispatch' }}
     steps:
@@ -106,4 +133,4 @@ jobs:
               title: `Purge Azure test resources failed - Run ID: ${context.runId}`,
               labels: ['bug', 'test-failure'],
               body: `## Bug information \n\nThis bug is generated automatically if the purge Azure test resources workflow fails. For the further investigation, please visit [here](${process.env.ACTION_LINK}).`
-            })
+            })