Add test workflow

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: Run test and upload coverage
+
+on: 
+  push
+
+jobs:
+  test:
+    name: Run tests and collect coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run tests
+        run: go test -coverprofile=coverage.txt
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: spalmurray-codecov-org/go-demo
+