Actions - missing gpg for nightly version bump

.github/workflows/build.yml

@@ -327,6 +327,16 @@ jobs:
               sudo touch .tmp/bump
             fi
 
+        - name: Import GPG key
+
+          uses: crazy-max/ghaction-import-gpg@v3
+          with:
+            gpg-private-key: ${{ secrets.GPG_KEY2 }}
+            passphrase: ${{ secrets.GPG_PASSPHRASE2 }}
+            workdir: build
+            git-user-signingkey: true
+            git-commit-gpgsign: true
+
         - name: Bump version
 
           if: ${{ success() }}