CI: add pgp keys expire check

Author: GustavoStingelin

.github/workflows/main.yml

@@ -540,6 +540,22 @@ jobs:
       - name: Release notes check
         run: scripts/check-release-notes.sh
 
+  ########################
+  # Check release signing keys
+  ########################
+  pgp-key-expiration-check:
+    name: Check release signing key expirations
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+
+      - name: Clean up runner space
+        uses: ./.github/actions/cleanup-space
+
+      - name: Check PGP key expirations
+        run: scripts/check-pgp-expiry.sh
+
   ########################
   # Backwards Compatibility Test
   ########################