ci: adds a workflow

.github/workflows/test.yaml

@@ -0,0 +1,51 @@
+name: Tests
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+
+      - name: Install dependencies
+        run: go get .
+
+      - name: Check formatting
+        run: |
+          fmt_files=$(gofmt -l .)
+          if [ -n "$fmt_files" ]; then
+            echo "Go code is not formatted. Please run 'go fmt'."
+            gofmt -d .
+            exit 1
+          fi
+
+      - name: Tidy go.mod and go.sum
+        run: |
+          go mod tidy
+          git diff --exit-code go.mod go.sum
+          if [ $? -ne 0 ]; then
+            echo "go.mod or go.sum is not tidy. Please run 'go mod tidy'."
+            exit 1
+          fi
+
+      - name: Run go vet
+        run: go vet ./...
+
+      - name: Build
+        run: go build .
+
+      - name: Test with the Go CLI
+        run: go test -v -coverprofile=coverage.out ./...
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-report
+          path: coverage.out