chore: Add test.yml GitHub Actions workflow for running tests

- Adds a CI workflow to run tests on pull requests and direct pushes to the develop branch.
- Generates test coverage reports.

Author: KengoWada

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+name: Test and Coverage
+
+on:
+  push:
+    branches: [ develop, staging, main ]
+  pull_request:
+    branches: [ develop, staging, main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.23'
+    
+    - name: Install dependencies
+      run: go get .
+    
+    - name: Build and Test
+      run: |
+        go build -v ./...
+        go test -v -coverprofile=coverage.txt ./...
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v5
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        slug: KengoWada/taskqueue