Use single workflow for building and deploying (master only)

.github/workflows/build.yml

@@ -1,16 +1,35 @@
 name: build
 
-on: [push]
+on: push
 
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: ruby/setup-ruby@v1
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Setup Ruby
+      uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true
     - name: Run RSpec
       run: bundle exec rake spec
     - name: Run RuboCop
       run: bundle exec rake rubocop
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref_name == 'master'
+    steps:
+    - name: Install SSH key
+      uses: shimataro/ssh-key-action@v2
+      with:
+        key: ${{ secrets.SSH_PRIVATE_KEY }}
+        known_hosts: ${{ secrets.SSH_KNOWN_HOSTS }}
+    - name: Connect and update
+      run: |
+        ssh ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} -p${{ secrets.SSH_PORT }} \
+          "cd ${{ secrets.SSH_WORKING_DIR }} && \
+           git pull && \
+           bundle install && \
+           sudo systemctl restart rubies"