Add coverage badge

.github/workflows/ci.yaml

@@ -8,6 +8,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
@@ -17,5 +19,24 @@ jobs:
       - name: Build
         run: go build -v ./...
       - name: Test with the Go CLI
-        run: go test
+        run: |
+          go test -v ./... -covermode=count -coverprofile=coverage.out
+          go tool cover -func=coverage.out -o=coverage.out
+      - name: Go Coverage Badge  # Pass the `coverage.out` output to this action
+        uses: tj-actions/coverage-badge-go@v2
+        with:
+          filename: coverage.out
+      - name: Verify Changed files
+        uses: tj-actions/verify-changed-files@v16
+        id: verify-changed-files
+        with:
+          files: README.md
+      - name: Commit and push changes
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add README.md
+          git commit -m "chore: Updated coverage badge."
+          git push
 

README.md

@@ -1,6 +1,7 @@
 # RingChan
 
 [![CI](https://github.com/floatdrop/ringchan/actions/workflows/ci.yaml/badge.svg)](https://github.com/floatdrop/ringchan/actions/workflows/ci.yaml)
+![Coverage](https://img.shields.io/badge/Coverage-90.9%25-brightgreen)
 [![Go Report Card](https://goreportcard.com/badge/github.com/floatdrop/ringchan)](https://goreportcard.com/report/github.com/floatdrop/ringchan)
 [![Go Reference](https://pkg.go.dev/badge/github.com/floatdrop/ringchan.svg)](https://pkg.go.dev/github.com/floatdrop/ringchan)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)