Add semver breaking changes detection

.github/workflows/go.yml

@@ -12,7 +12,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
 
       - name: Set up Go
         uses: actions/setup-go@v4
@@ -38,3 +39,27 @@ jobs:
 
       - name: Tests
         run: go test -v ./...
+
+  run_modver:
+      runs-on: ubuntu-latest
+      needs: build # Only run when build job was successful
+      if: ${{ github.event_name == 'pull_request' && success() }}
+      permissions:
+        contents: read # Modver needs to read the repo content
+        pull-requests: write # Modver needs to write comments/status on PRs
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+          with:
+            fetch-depth: 0 # Modver needs full history for comparison
+
+        - name: Set up Go
+          uses: actions/setup-go@v4
+          with:
+            go-version: "stable"
+
+        - name: Modver
+          uses: bobg/modver@v2.5.0
+          with:
+            github_token: ${{ secrets.GITHUB_TOKEN }}
+            pull_request_url: https://github.com/${{ github.repository }}/pull/${{ github.event.number }}