Get short commit ref using a more proper method

patches/server/0719-Add-git-branch-and-commit-to-manifest.patch

@@ -5,12 +5,12 @@ Subject: [PATCH] Add git branch and commit to manifest
 
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index e4d1fe13d541fb0e7eee81607d9651cdf7032cb0..39beb0331282b297f4f3857560d24ce6a616210d 100644
+index 2172b842ecd76a34d19fcaa54e087cc5b9ab8d7f..ff58e15e559c48d0dcf049e1b7708b71c0b789b6 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -78,6 +78,7 @@ tasks.jar {
          val git = Git(rootProject.layout.projectDirectory.path)
-         val gitHash = git("rev-parse", "HEAD").getText().substring(0, 7)
+         val gitHash = git("rev-parse", "--short=7", "HEAD").getText()
          val implementationVersion = System.getenv("BUILD_NUMBER") ?: "\"$gitHash\""
 +        val gitBranch = git("rev-parse", "--abbrev-ref", "HEAD").getText().trim() // Paper
          attributes(