Move to new coverage approach

Author: angusmcleod

.github/workflows/plugin-tests.yml

@@ -141,7 +141,12 @@ jobs:
 
       - name: Plugin RSpec with Coverage
         if: matrix.build_type == 'backend' && steps.check_spec.outputs.files_exists == 'true'
-        run: SIMPLECOV=1 bin/rake plugin:spec[${{ steps.repo-name.outputs.value }}]
+        run: |
+          if [ -e plugins/${{ steps.repo-name.outputs.value }}/.simplecov ]
+            cp plugins/${{ steps.repo-name.outputs.value }}/.simplecov .simplecov
+            export COVERAGE=1
+          fi
+          bin/rake plugin:spec[${{ steps.repo-name.outputs.value }}]
 
       - name: Plugin QUnit
         if: matrix.build_type == 'frontend' && steps.check_qunit.outputs.files_exists == 'true'

.simplecov

@@ -0,0 +1,6 @@
+plugin = "discourse-custom-wizard"
+
+SimpleCov.configure do
+  track_files "plugins/#{plugin}/**/*.rb"
+  add_filter { |src| !(src.filename =~ /(\/#{plugin}\/app\/|\/#{plugin}\/lib\/)/) }
+end