add code coverage (#26)

* add code coverage

* update coverage

* update token

.github/workflows/test.yaml

@@ -4,6 +4,7 @@ on:
   pull_request:
     branches:
       - main
+  workflow_dispatch:
 
 jobs:
   test:
@@ -25,5 +26,19 @@ jobs:
     - name: setup tests
       run: ./setup-test.sh
 
-    - name: Run tests
-      run: go test ./...
+    - name: Run tests and generate coverage report
+      run: |
+        go test -coverprofile=coverage.out ./...
+        go tool cover -func=coverage.out -o coverage.txt
+        go tool cover -html=coverage.out -o coverage.html
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v4
+      with:
+        verbose: true
+        name: codecov-umbrella
+        file: coverage.txt
+        fail_ci_if_error: true
+        slug: knbr13/gitcs
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}