.github/workflows/generator.yml in shakapacker-7.2.0 vs .github/workflows/generator.yml in shakapacker-7.2.1

@@ -1,8 +1,12 @@
 name: Generator specs
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
 
 jobs:
   test:
     name: Generator specs
     runs-on: ${{ matrix.os }}
@@ -33,9 +37,14 @@
         with:
           persist-credentials: false
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+      # Bundler 2.5.0 dropped support for Ruby 2.6 and 2.7
+      - name: Use Bundler 2.4.22
+        run: |
+          gem install bundler -v '2.4.22'
+          bundle config --local path vendor/bundle
       - name: Install dependencies
         run: bundle install
       - run: bundle exec rake run_spec:generator
         env:
           SHAKAPACKER_USE_PACKAGE_JSON_GEM: ${{ matrix.use_package_json_gem }}