I changed the key in CI to something else, use this to debug.

Author: nedtwigg

.github/workflows/deploy.yml

@@ -31,7 +31,7 @@ jobs:
       ORG_GRADLE_PROJECT_nexus_user: ${{ secrets.NEXUS_USER }}
       ORG_GRADLE_PROJECT_nexus_pass: ${{ secrets.NEXUS_PASS }}
       ORG_GRADLE_PROJECT_gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
-      ORG_GRADLE_PROJECT_gpg_key64: ${{ secrets.GPG_KEY64 }}
+      ORG_GRADLE_PROJECT_gpg_key64_test: ${{ secrets.ORG_GRADLE_PROJECT_GPG_KEY64_TEST }}
 
         gradle_key
     steps:

gradle/java-publish.gradle

@@ -158,7 +158,14 @@ model {
 
 if (!version.endsWith('-SNAPSHOT')) {
 	signing {
-		String gpg_key = new String(System.env['ORG_GRADLE_PROJECT_gpg_key64'].decodeBase64())
+		String original = System.env['ORG_GRADLE_PROJECT_gpg_key64_test']
+		System.out.println("/ORIGINAL")
+		System.out.println(original)
+		System.out.println("\\ORIGINAL")
+		System.out.println("/DECODED")
+		System.out.println(original.decodeBase64())
+		System.out.println("\\DECODED")
+		String gpg_key = new String(System.env['ORG_GRADLE_PROJECT_gpg_key64_test'].decodeBase64())
 		useInMemoryPgpKeys(gpg_key, System.env['ORG_GRADLE_PROJECT_gpg_passphrase'])
 		sign(publishing.publications)
 	}