Параметры тега изображения файла Jenkins не работают

Я пытаюсь автоматически пометить свое изображение через конвейер Дженкинса, но он работает не так, как я ожидал. Я плохо разбираюсь в конвейерах и, вероятно, упускаю что-то элементарное, но любая помощь будет принята с благодарностью.

Я надеюсь использовать встроенные переменные {env.BUILD_NUMBER}, которые предоставляет Jenkins. Я могу вывести номер сборки, но не передать его в команду «imagebuilder».

Ошибка:

[redFalconMonolith_RedFalcon-ZN46VHZ6UQAAXE632CFKUEXEBHIA52MJYXHIH6VUHK3MOAOQB64A] Running shell script
+ echo Build number: 108
Build number: 108
[Pipeline] sh
[redFalconMonolith_RedFalcon-ZN46VHZ6UQAAXE632CFKUEXEBHIA52MJYXHIH6VUHK3MOAOQB64A] Running shell script
+ echo Image Tag: gcr.io/redfalcon-186521/redfalcon-webserver-minimal:RedFalcon.108
Image Tag: gcr.io/redfalcon-186521/redfalcon-webserver-minimal:RedFalcon.108

groovy.lang.MissingPropertyException: No such property: KEY for class: groovy.lang.Binding
    at groovy.lang.Binding.getVariable(Binding.java:63)
    at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:242)
    at org.kohsuke.groovy.sandbox.impl.Checker$6.call(Checker.java:288)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:292)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:268)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:268)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:268)
    at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:29)
    at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
    at WorkflowScript.run(WorkflowScript:46)
    at ___cps.transform___(Native Method)
    at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:74)
    at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
    at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:66)
    at sun.reflect.GeneratedMethodAccessor411.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
    at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
    at com.cloudbees.groovy.cps.Next.step(Next.java:83)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:122)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:261)
    at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$101(SandboxContinuable.java:34)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.lambda$run0$0(SandboxContinuable.java:59)
    at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java:108)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:58)
    at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:174)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:332)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$200(CpsThreadGroup.java:83)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:244)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:232)
    at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:64)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:131)
    at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
    at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE

Код:

def project = 'redfalcon-186521'
def  appName = 'redfalcon-webserver-minimal'
...

stage('Build Container') {
            steps {
                container('redfalcon-golang') {
                    sh "echo Build number: ${env.BUILD_NUMBER}"
                    sh "echo Image Tag: gcr.io/${project}/${appName}:${env.BRANCH_NAME}.${env.BUILD_NUMBER}"
                    sh "imagebuilder -t gcr.io/${project}/${appName}:${env.BRANCH_NAME}.${env.BUILD_NUMBER} --build-arg GITHUB_OATH_KEY=$KEY -f DockerFiles/Dockerfile.local ."
                }
            }
        }