Update plugin-git and add renovate trigger (#3901)

Co-authored-by: Robert Kaussow <mail@thegeeklab.de>

.github/renovate.json

@@ -1,6 +1,16 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["github>woodpecker-ci/renovate-config"],
+  "customManagers": [
+    {
+      "customType": "regex",
+      "fileMatch": ["shared/constant/constant.go"],
+      "matchStrings": [
+        "//\\s*renovate:\\s*datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\s+DefaultCloneImage = \"docker.io/woodpeckerci/plugin-git:(?<currentValue>.*)\""
+      ],
+      "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}"
+    }
+  ],
   "packageRules": [
     {
       "matchCurrentVersion": "<1.0.0",

shared/constant/constant.go

@@ -33,7 +33,8 @@ var DefaultConfigOrder = [...]string{
 
 const (
 	// DefaultCloneImage can be changed by 'WOODPECKER_DEFAULT_CLONE_IMAGE' at runtime.
-	DefaultCloneImage = "docker.io/woodpeckerci/plugin-git:2.4.0"
+	// renovate: datasource=docker depName=woodpeckerci/plugin-git
+	DefaultCloneImage = "docker.io/woodpeckerci/plugin-git:2.5.1"
 )
 
 var TrustedCloneImages = []string{