Review deployment.

.github/workflows/release.yaml

@@ -10,10 +10,12 @@ jobs:
       - uses: actions/checkout@v2
         with:
           token: ${{ secrets.GIT_ACTION_TOKEN }}
-      - name: git-configure
-        run: |
-            git config user.email "actions@github.com"
-            git config user.name "GitHub Actions"
+      - uses: crazy-max/ghaction-import-gpg@v4
+        with:
+          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+          passphrase: ${{ secrets.GPG_PASSPHRASE }}
+          git_user_signingkey: true
+          git_commit_gpgsign: true
       - uses: actions/setup-java@v2
         with:
           distribution: temurin