Add support for Google Application Default Credentials

This will try ADC as the last option if the container registry to push
to is GCR or GAR. This should be equivalent to how the Maven and Gradle
Jib plugins handle it.

Resolves quarkusio#36306

Author: michaelkanis-dmtech

extensions/container-image/container-image-jib/deployment/src/main/java/io/quarkus/container/image/jib/deployment/JibProcessor.java

@@ -383,6 +383,8 @@ private RegistryImage toRegistryImage(ImageReference imageReference, Optional<St
                 }
                 registryImage.addCredentialRetriever(credentialRetrieverFactory.dockerConfig(dockerConfigPath));
             }
+
+            registryImage.addCredentialRetriever(credentialRetrieverFactory.googleApplicationDefaultCredentials());
         }
         return registryImage;
     }