Update Jenkinsfile for new default branch

Jenkinsfile

@@ -75,13 +75,9 @@
     }
 
     environment {
-      APP_NAME = 'geoip-rest-api'
-      NAMESPACE = 'foundation-internal-webdev-apps'
-      IMAGE_NAME = 'eclipsefdn/geoip-rest-api'
-      CONTAINER_NAME = 'app'
       ENVIRONMENT = sh(
         script: """
-          if [ "${env.BRANCH_NAME}" = "master" ]; then
+          if [ "${env.BRANCH_NAME}" = "main" ]; then
             printf "production"
           else
             printf "${env.BRANCH_NAME}"