Allow manually triggering workflow run

Author: ur5us

.github/workflows/main.yml

@@ -6,6 +6,7 @@ on:
   push:
     paths-ignore:
       - 'README.md'
+  workflow_dispatch:
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -48,4 +49,4 @@ jobs:
           sudo apt-get -yqq install libpq-dev
           bundle
           bundle exec appraisal rails_${{ matrix.rails_version }} bundle
-          bundle exec appraisal rails_${{ matrix.rails_version }} rake
+          bundle exec appraisal rails_${{ matrix.rails_version }} rake