CI: Add Testmon cache restoration for test selective run

.github/actions/check-cache/action.yml

@@ -0,0 +1,72 @@
+name: 'Wait for main Cache Update'
+description: 'Waits for the main cache update workflow to complete before proceeding with tests'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Wait for main cache update
+      if: github.event_name == 'pull_request'
+      shell: bash
+      run: |
+        echo "Checking if main cache update is running..."
+
+        # First check if the workflow file exists on the main branch
+        if ! gh api repos/${GITHUB_REPOSITORY}/actions/workflows/update-testmondata-cache.yml --silent 2>/dev/null; then
+          echo "::notice::Cache update workflow (update-testmondata-cache.yml) not found on main branch yet."
+          echo "::notice::This is expected before the workflow is merged. Skip for now"
+          exit 0
+        fi
+
+        max_attempts=60
+        attempt=0
+        final_conclusion=""
+
+        while [ $attempt -lt $max_attempts ]; do
+          # Check workflow conclusion for base commit
+          WORKFLOW_CONCLUSION=$(gh run list \
+            --workflow=update-testmondata-cache.yml \
+            --branch=main \
+            --json status,conclusion,headSha \
+            --jq ".[] | select(.headSha == \"$BASE_SHA\") | .conclusion")
+
+          if [ "$WORKFLOW_CONCLUSION" == "success" ]; then
+            echo "::notice::main cache update completed successfully"
+            final_conclusion="success"
+            break
+          elif [ "$WORKFLOW_CONCLUSION" == "failure" ] || [ "$WORKFLOW_CONCLUSION" == "cancelled" ]; then
+            echo "::warning::main cache update workflow failed or was cancelled"
+            final_conclusion="$WORKFLOW_CONCLUSION"
+            break
+          elif [ -z "$WORKFLOW_CONCLUSION" ]; then
+            # Check if workflow exists but hasn't completed
+            WORKFLOW_EXISTS=$(gh run list \
+              --workflow=update-testmondata-cache.yml \
+              --branch=main \
+              --json headSha \
+              --jq ".[] | select(.headSha == \"$BASE_SHA\") | .headSha")
+
+            if [ -z "$WORKFLOW_EXISTS" ]; then
+              echo "::notice::No cache update workflow found for base commit (using existing cache)"
+              break
+            fi
+          fi
+
+          attempt=$((attempt + 1))
+          echo "::notice::Attempt $attempt/$max_attempts: Cache update still running, waiting 10s..."
+          sleep 10
+        done
+
+        if [ $attempt -eq $max_attempts ]; then
+          echo "::error::Timeout waiting for cache update. Cannot proceed without verified cache."
+          exit 1
+        fi
+
+        # Verify the workflow completed successfully
+        if [ "$final_conclusion" == "failure" ] || [ "$final_conclusion" == "cancelled" ]; then
+          echo "::error::Cache update workflow did not complete successfully (status: $final_conclusion). Cannot proceed with tests."
+          exit 1
+        fi
+      env:
+        GITHUB_REPOSITORY: ${{ github.repository }}
+        BASE_SHA: ${{ github.event.pull_request.base.sha }}
+        GH_TOKEN: ${{ github.token }}

.github/actions/testmon-cache/action.yml

@@ -0,0 +1,37 @@
+name: 'Restore Testmon Cache'
+description: 'Restores testmon data from cache'
+inputs:
+  testmon-datafile:
+    description: 'Path to the testmon data file'
+    required: true
+    default: '.testmondata'
+  cache-key:
+    description: 'Base cache key for testmon data'
+    required: true
+    default: 'testmondata-all'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Restore testmondata cache
+      id: testmon-cache
+      uses: actions/cache/restore@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+      with:
+        path: ${{ inputs.testmon-datafile }}
+        key: ${{ inputs.cache-key }}-${{ github.base_ref || 'main' }}-${{ github.sha }}
+        restore-keys: |
+          ${{ inputs.cache-key }}-${{ github.base_ref || 'main' }}-
+          ${{ inputs.cache-key }}-main-
+
+    - name: Check testmon cache status
+      shell: bash
+      env:
+        EVENT_NAME: ${{ github.event_name }}
+        TESTMON_FILE: ${{ inputs.testmon-datafile }}
+      run: |
+          if [ -f "$TESTMON_FILE" ]; then
+            echo "Testmon cache restored successfully"
+            ls -lh "$TESTMON_FILE"
+          else
+            echo "No testmon cache found - will run all tests"
+          fi