Removed release conditionals in Jenkinsfile

Since we do not release new versions on `release` branch anymore

Jenkinsfile

@@ -12,16 +12,13 @@ pipeline {
       when {
         anyOf {
           branch 'master'
-          branch 'release'
           buildingTag()
         }
       }
       steps {
         script {
           env.DOCKER_TAG = 'master'
-          if (env.BRANCH_NAME == 'release') {
+
-            env.DOCKER_TAG = 'release'
-          }
           if (env.TAG_NAME) {
             env.DOCKER_TAG = env.TAG_NAME
           }
@@ -39,4 +36,4 @@ pipeline {
       }
     }
   }
-}
+}