ci(test): Visualize code coverage (#109)

Upload to Codecov and add comments to PRs.

.github/README.md

@@ -17,6 +17,7 @@
 [![Test](https://img.shields.io/github/actions/workflow/status/5ouma/mli/test.yml?label=test&style=flat-square)](https://github.com/5ouma/mli/actions/workflows/test.yml)
 [![Release](https://img.shields.io/github/actions/workflow/status/5ouma/mli/release.yml?label=release&style=flat-square)](https://github.com/5ouma/mli/actions/workflows/release.yml)
 [![pre-commit.ci status](https://results.pre-commit.ci/badge/github/5ouma/mli/main.svg?style=flat-square)](https://results.pre-commit.ci/latest/github/5ouma/mli/main)
+[![codecov](https://codecov.io/gh/5ouma/mli/graph/badge.svg?token=GHN8H6W1LZ)](https://codecov.io/gh/5ouma/mli)
 
 </div>
 

.github/workflows/test.yml

@@ -32,5 +32,10 @@ jobs:
       - name: 📊 Static Analysis
         run: go vet -v ./...
 
-      - name: 🧪 Test Packages
-        run: go test -v -race ./...
+      - name: 🧪 Run Tests
+        run: go test -v -race ./... -coverprofile=coverage.txt -covermode=atomic
+
+      - name: ☂️ Upload Coverage
+        uses: codecov/codecov-action@e28ff129e5465c2c0dcc6f003fc735cb6ae0c673 # v4.5.0
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -1,2 +1,3 @@
-mli
-dist/
+/mli
+/dist/
+/coverage.txt