Update GitHub Actions workflow for testing

Changed pull request trigger to pull_request_target and enabled coverage publishing.

.github/workflows/tester.yml

@@ -1,7 +1,7 @@
 name: "Testing Pull Request"
 
 on:
-  pull_request:
+  pull_request_target:
     branches:
       - "master"
       - "dev"
@@ -74,14 +74,5 @@ jobs:
           path: ./cobertura.xml
           threshold: 80.123
           fail: true
-          publish: false   # here we prevent branch push, see issue #548
+          publish: true
           coverage-summary-title: "Code Coverage Summary"
-
-      # post the summary as a PR comment, see issue #548
-      - name: Comment PR with coverage
-        uses: marocchino/sticky-pull-request-comment@v2
-        with:
-          header: coverage-report
-          message: |
-            ### Code Coverage Report
-            ${{ steps.coverage.outputs.summary }}