workflow: check if environment variables are not empty

.github/workflows/release.yml

@@ -29,17 +29,28 @@ jobs:
             ${{ runner.os }}-go-mod-
 
       - name: Build for GitHub Actions
+        env:
+          PRIVATE_PGP_KEY_CONTENT: ${{ secrets.PRIVATE_PGP_KEY_CONTENT }}
+          PRIVATE_PGP_KEY_PASSPHRASE: ${{ secrets.PRIVATE_PGP_KEY_PASSPHRASE }}
         run: |
           set -e  # Exit immediately if any command fails
+      
+          # Check if environment variables are not empty
+          if [ -z "$PRIVATE_PGP_KEY_CONTENT" ]; then
+            echo "Error: PRIVATE_PGP_KEY_CONTENT is empty or not set."
+            exit 1
+          fi
+          if [ -z "$PRIVATE_PGP_KEY_PASSPHRASE" ]; then
+            echo "Error: PRIVATE_PGP_KEY_PASSPHRASE is empty or not set."
+            exit 1
+          fi
+          # Proceed with the build process
           echo "$PRIVATE_PGP_KEY_CONTENT" > crypto/privkey.pem
           echo "$PRIVATE_PGP_KEY_PASSPHRASE" > crypto/passphrase.txt
           chmod 600 crypto/privkey.pem crypto/passphrase.txt  # Restrict file permissions
           make build_gh_actions
           rm -f crypto/privkey.pem crypto/passphrase.txt  # Clean up sensitive files
-        env:
-          PRIVATE_PGP_KEY_CONTENT: ${{ secrets.PRIVATE_PGP_KEY_CONTENT }}
-          PRIVATE_PGP_KEY_PASSPHRASE: ${{ secrets.PRIVATE_PGP_KEY_PASSPHRASE }}
-
+
       - name: Get Version from Makefile
         id: get_version
         run: |