External jenkins test job images failed to create and didn't fail the build_image steps

Jobs failed at compiling stage but get `BUILD SUCCESSFUL` and continued to run test stage.

https://ci.adoptopenjdk.net/view/Test_external/job/Test_openjdk11_hs_extended.external_x86-64_linux_jenkins/30/console

```
23:15:29 [exec] ---> ea5c394c8d3b
23:15:29 [exec] Step 8/21 : RUN apt-get update && apt-get install -y --no-install-recommends git maven && rm -rf /var/lib/apt/lists/*
23:15:29 [exec] ---> Running in c55b0d10c17e
23:15:30 [exec] no status provided on response: unknown
23:15:30 [exec] Result: 1
23:15:30
23:15:30 dist:
23:15:30 [copy] Copying 2 files to /home/jenkins/workspace/Test_openjdk11_hs_extended.external_x86-64_linux_jenkins/jvmtest/external/jenkins
23:15:30
23:15:30 BUILD SUCCESSFUL
23:15:30 Total time: 45 seconds
23:15:30 0
```