[v8.5.x] CI: Backport grafana-com publishing (#65168)

[v8.5.x] Backport grafana-com publishing

This should complete #56797.

pkg/build/git/git.go

@@ -0,0 +1,25 @@
+package git
+
+import (
+	"fmt"
+	"regexp"
+)
+
+const (
+	MainBranch                 = "main"
+	HomeDir                    = "."
+	RepoOwner                  = "grafana"
+	OSSRepo                    = "grafana"
+	EnterpriseRepo             = "grafana-enterprise"
+	EnterpriseCheckName        = "Grafana Enterprise"
+	EnterpriseCheckDescription = "Downstream tests to ensure that your changes are compatible with Grafana Enterprise"
+)
+
+func PRCheckRegexp() *regexp.Regexp {
+	reBranch, err := regexp.Compile(`^prc-([0-9]+)-([A-Za-z0-9]+)\/(.+)$`)
+	if err != nil {
+		panic(fmt.Sprintf("Failed to compile regexp: %s", err))
+	}
+
+	return reBranch
+}