CI: add pgp keys expire check

.github/workflows/release.yaml

@@ -15,6 +15,22 @@ env:
   GO_VERSION: 1.23.12
 
 jobs:
+  ########################
+  # 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: Check PGP key expirations
+        run: scripts/check-pgp-expiry.sh
+
+  ########################
+  # Create release
+  ########################
   main:
     name: Release build
     runs-on: ubuntu-latest