ci: report mutation testing results to Stryker dashboard

Configure Infection's Stryker logger to upload the HTML report for the 1.x
branch. The dashboard API key is read from the STRYKER_DASHBOARD_API_KEY
environment variable, wired to a GitHub Actions secret and only set on push
to 1.x so pull requests (and forks) never overwrite the branch report.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: roxblnfk

.github/workflows/infection.yml

@@ -48,3 +48,8 @@ jobs:
 
       - name: 🧬 Run mutation testing with Infection
         run: composer infect:ci
+        env:
+          # Upload the report to the Stryker dashboard only on push to 1.x.
+          # On pull requests (and forks) the key is empty, so Infection skips the upload
+          # instead of overwriting the branch report with PR data.
+          STRYKER_DASHBOARD_API_KEY: ${{ github.event_name == 'push' && secrets.STRYKER_DASHBOARD_API_KEY || '' }}

infection.json

@@ -7,5 +7,10 @@
     },
     "timeout": 10,
     "testFramework": "testo",
-    "tmpDir": "runtime"
+    "tmpDir": "runtime",
+    "logs": {
+        "stryker": {
+            "report": "1.x"
+        }
+    }
 }