added go-test workflow

.github/workflows/go-test.yaml

@@ -0,0 +1,35 @@
+name: Go Tests
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    name: Run Go Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.22"
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Test solana_exporter
+        run: go test -v ./cmd/solana_exporter/...
+
+      - name: Test rpc package
+        run: go test -v ./pkg/rpc/...
+
+      - name: Run all tests with coverage
+        run: go test -v -coverprofile=coverage.out ./...
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-report
+          path: coverage.out