Add mill-plugin mutation testing job

Author: hugo-vrijswijk

.github/workflows/mutation-testing.yml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0
       - uses: ./.github/setup
       - name: Run Stryker4s
-        run: sbt 'core/stryker --reporters console --reporters dashboard'
+        run: sbt 'core3/stryker --reporters console --reporters dashboard'
         env:
           STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
 
@@ -34,6 +34,19 @@ jobs:
         env:
           STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
 
+  mill-plugin:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          # Fetch all commits, used by sbt-dynver plugin to determine version
+          fetch-depth: 0
+      - uses: ./.github/setup
+      - name: Run Stryker4s
+        run: sbt 'millPlugin/stryker --reporters console --reporters dashboard'
+        env:
+          STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
+
   maven-plugin:
     runs-on: ubuntu-latest
     steps: