chore: remove ORG_ from ORG_REGISTRY_USER and ORG_REGISTRY_PASSWORD

Author: surajkumar

JShellAPI/build.gradle

@@ -30,8 +30,8 @@ jib {
     to {
         image = 'togetherjava.org:5001/togetherjava/jshellbackend:master' ?: 'latest'
         auth {
-            username = System.getenv('ORG_REGISTRY_USER') ?: ''
-            password = System.getenv('ORG_REGISTRY_PASSWORD') ?: ''
+            username = System.getenv('REGISTRY_USER') ?: ''
+            password = System.getenv('REGISTRY_PASSWORD') ?: ''
         }
     }
     container {

JShellWrapper/build.gradle

@@ -26,8 +26,8 @@ jib {
     to {
         image = rootProject.ext.jShellWrapperImageName
         auth {
-            username = System.getenv('ORG_REGISTRY_USER') ?: ''
-            password = System.getenv('ORG_REGISTRY_PASSWORD') ?: ''
+            username = System.getenv('REGISTRY_USER') ?: ''
+            password = System.getenv('REGISTRY_PASSWORD') ?: ''
         }
     }
     container {