clean up mutation config

.github/workflows/mutation.yml

@@ -31,8 +31,8 @@ jobs:
         if: github.event_name == 'pull_request'
         run: |
           git fetch --depth=1 origin $GITHUB_BASE_REF
-          # Explicitly specify GitHub logger since our Stryker reporting will otherwise disable it.
-          php vendor/bin/infection --threads=max --git-diff-lines --git-diff-base=origin/$GITHUB_BASE_REF --logger-github --only-covered --min-covered-msi=100
+          # nproc returns 4 threads on GitHub Actions and this seems to provide the best performance.
+          composer mutation-diff-lines
 
       - name: Run Infection for all files
         if: github.event_name == 'push'

composer.json

@@ -132,6 +132,9 @@
         "mutation": [
             "infection --threads=max --only-covered"
         ],
+        "mutation-diff-lines": [
+            "infection --threads=max --only-covered --git-diff-lines --git-diff-base=origin/$GITHUB_BASE_REF --min-covered-msi=100"
+        ],
         "cs": "phpcs",
         "cbf": "phpcbf",
         "unit": [

infection.json5

@@ -9,6 +9,7 @@
         "stryker": {
             "report": "main"
         },
+        "github":  true,
         "html": "var/infection.html"
     },
     "mutators": {