feat(backstage): add coverage reporting tool

tools/sgbackstagecoverage/tools.go

@@ -0,0 +1,37 @@
+package sgbackstagecoverage
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+
+	"go.einride.tech/sage/sg"
+	"go.einride.tech/sage/tools/sggcov2lcov"
+)
+
+func PostCoverage(ctx context.Context, entity string) error {
+	sg.Deps(ctx, sggcov2lcov.Command)
+	url := fmt.Sprintf("https://api.roadie.so/api/code-coverage/report?entity=%s&coverageType=lcov", entity)
+	coverFile := sg.FromBuildDir("go", "coverage", "go-test.lcov")
+	f, err := os.Open(coverFile)
+	if err != nil {
+		return fmt.Errorf("opening coverage file: %w", err)
+	}
+	req, err := http.NewRequestWithContext(ctx, "POST", url, f)
+	if err != nil {
+		return fmt.Errorf("creating coverage POST request: %w", err)
+	}
+	req.Header.Set("Content-Type", "text/plain")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", os.Getenv("ROADIE_AUTH_TOKEN")))
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("posting coverage data: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusCreated {
+		return fmt.Errorf("coverage post status not OK: %s", http.StatusText(resp.StatusCode))
+	}
+	return nil
+}