Make the workflow more consistent with ruby/ruby

Author: k0kubun

.github/workflows/deploy.yml

@@ -6,16 +6,14 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    if: ${{ github.repository == 'ruby/git.ruby-lang.org' }}
     steps:
-    - uses: actions/checkout@v5
-    - name: Set up SSH
-      env:
-        RUBY_GIT_SYNC_PRIVATE_KEY: ${{ secrets.RUBY_GIT_SYNC_PRIVATE_KEY }}
-      run: |
-        mkdir -p ~/.ssh
-        echo "$RUBY_GIT_SYNC_PRIVATE_KEY" > ~/.ssh/id_ed25519
-        chmod 600 ~/.ssh/id_ed25519
-        ssh-keyscan -t ed25519 git.ruby-lang.org >> ~/.ssh/known_hosts
-
-    - name: Sync /home/git/git.ruby-lang.org
-      run: ssh -i ~/.ssh/id_ed25519 [email protected] 'sudo -u git /home/git/git.ruby-lang.org/bin/update-git-ruby-lang-org.sh'
+      - name: Sync git.ruby-lang.org
+        run: |
+          mkdir -p ~/.ssh
+          echo "$RUBY_GIT_SYNC_PRIVATE_KEY" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+          ssh-keyscan -t ed25519 git.ruby-lang.org >> ~/.ssh/known_hosts
+          ssh -i ~/.ssh/id_ed25519 [email protected] "sudo -u git /home/git/git.ruby-lang.org/bin/update-git-ruby-lang-org.sh"
+        env:
+          RUBY_GIT_SYNC_PRIVATE_KEY: ${{ secrets.RUBY_GIT_SYNC_PRIVATE_KEY }}