[CHORE] Fix workflow

Author: Lemick

.github/workflows/build.yaml

@@ -16,6 +16,12 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
+      - name: Import GPG Key
+        uses: crazy-max/ghaction-import-gpg@v1
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_SIGNING_KEY }}
+          PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+
       - name: Set up JDK
         uses: actions/setup-java@v3
         with: