CI: Run tests when test example files change

Author: nodeg

.github/workflows/test.yml

@@ -11,7 +11,7 @@ on:
       - 'Gemfile'
       - 'Gemfile.lock'
       - 'bin/tetra'
-      - 'spec/'
+      - 'spec/**'
       - 'lib/template/bundled/'
       - '.github/workflows/test.yml'
   pull_request:
@@ -24,7 +24,7 @@ on:
       - 'Gemfile'
       - 'Gemfile.lock'
       - 'bin/tetra'
-      - 'spec/'
+      - 'spec/**'
       - 'lib/template/bundled/'
       - '.github/workflows/test.yml'