ci: add coverage report

.github/workflows/go.yml

@@ -20,14 +20,32 @@ jobs:
       - name: Display Go version
         run: go version
 
+      # install and tests
       - name: Install dependencies
         run: go mod download
-
       - name: Build
         run: go build -v ./...
-
       - name: Install staticcheck
         run: go install honnef.co/go/tools/cmd/staticcheck@latest
-
       - name: Test
         run: make test
+
+      # coverage
+      - name: Go Coverage Badge
+        uses: tj-actions/coverage-badge-go@v1
+        with:
+          green: 80
+          filename: coverage.out
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        id: auto-commit-action
+        with:
+          commit_message: Apply Code Coverage Badge
+          skip_fetch: true
+          skip_checkout: true
+          file_pattern: ./README.md
+      - name: Push Changes
+        if: steps.auto-commit-action.outputs.changes_detected == 'true'
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ github.token }}
+          branch: ${{ github.ref }}