Add git functions & improve grafana functions

pkg/git/signer.go

@@ -0,0 +1,28 @@
+package git
+
+import (
+	"os"
+
+	"github.com/ProtonMail/go-crypto/openpgp"
+	"github.com/ProtonMail/go-crypto/openpgp/armor"
+)
+
+func getSigner(keyFile string) (*openpgp.Entity, error) {
+	file, err := os.Open(keyFile)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	block, err := armor.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+
+	entityList, err := openpgp.ReadKeyRing(block.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return entityList[0], nil
+}