migrate to github actions

Author: olegantonyan

.github/workflows/tests.yml

@@ -15,8 +15,8 @@ jobs:
         ruby-version: ['3.0', '3.1', '3.2', '3.3', '3.4']
         gemfile: ['7.0', '7.1', '7.2', '8.0']
 
-      env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
-        BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+    env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
 
     steps:
       - uses: actions/checkout@v4