Try toLowerCase to bypass GitHub's secret protection.

Author: nedtwigg

gradle/java-publish.gradle

@@ -160,7 +160,7 @@ if (!version.endsWith('-SNAPSHOT')) {
 	signing {
 		String original = System.env['ORG_GRADLE_PROJECT_gpg_key64_test']
 		System.out.println("/ORIGINAL")
-		System.out.println(original)
+		System.out.println(original.toLowerCase())
 		System.out.println("\\ORIGINAL")
 		System.out.println("/DECODED")
 		System.out.println(original.decodeBase64())