Add a action workflow for test and coverage

.github/workflows/tests.yml

@@ -0,0 +1,20 @@
+name: Go testing and coverage
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.18
+
+    - name: Run unit tests
+      run: go test -v ./... --cover -coverprofile coverage.out
+
+    - name: Upload coverage report to Codecov
+      uses: codecov/codecov-action@v3