Add GITHUB_SHA environment variable to Gradle build

Author: TylerS1066

.github/workflows/gradle.yaml

@@ -33,6 +33,7 @@ jobs:
         run: ./gradlew clean shadowJar --parallel
         env:
           RELEASE_VERSION: ${{ github.event.release.tag_name }}
+          GITHUB_SHA: ${{ github.sha }}
 
       - name: Stage jar for Actions
         if: ${{ github.event_name != 'release' }}