Include encoding in signature payload (#30174) (#30181)

Backport #30174 by @KN4CK3R

Fixes #30119

Include the encoding in the signature payload.

before

![grafik](01ab94a3-8af5-4d6f-be73-a10b65a15421)

after

![grafik](3a37d438-c70d-4d69-b178-d170e74aa683)

---------

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

modules/git/commit_reader.go

@@ -84,6 +84,8 @@ readLoop:
 				commit.Committer = &Signature{}
 				commit.Committer.Decode(data)
 				_, _ = payloadSB.Write(line)
+			case "encoding":
+				_, _ = payloadSB.Write(line)
 			case "gpgsig":
 				_, _ = signatureSB.Write(data)
 				_ = signatureSB.WriteByte('\n')