Added GitHub Actions CI workflow and initial unit tests

- Added .github/workflows/go-test.yml for automated CI testing using GitHub Actions
- Implemented unit tests for:
  • utils/release.go (FetchLatestRelease)
  • routes/builds.go (buildsHandler)
  • routes/status.go (statusHandler)
- Ensured tests run with go test ./... -v -cover
- Included go vet and gofmt checks in the CI pipeline
- Improved project reliability and continuous integration setup

NewProxy/tests/release_test.go

@@ -0,0 +1,26 @@
+package tests
+
+import (
+	"newproxy/utils"
+	"os"
+	"testing"
+)
+
+func TestFetchLatestRelease_ValidFile(t *testing.T) {
+	content := `{"release_version": "v1.0.0", "release_time": "2025-01-01T00:00:00Z"}`
+	_ = os.WriteFile("data/release.json", []byte(content), 0644)
+	utils.FetchLatestRelease()
+
+	if utils.LatestRelease.ReleaseVersion != "v1.0.0" {
+		t.Errorf("Expected version v1.0.0, got %s", utils.LatestRelease.ReleaseVersion)
+	}
+}
+
+func TestFetchLatestRelease_MissingFile(t *testing.T) {
+	_ = os.Remove("data/release.json")
+	utils.FetchLatestRelease()
+
+	if utils.LatestRelease.ReleaseVersion == "" {
+		t.Errorf("Expected default release info, got empty version")
+	}
+}