Maintainer support needed: Maven build is broken in GitHub CI

[lwille]

The mvn verify command doesn't work when running in GitHub Actions.

On my local machine everything works, however on GitHub the following errors occur:

Results :
Tests in error:
  find_by_deploymentSpec_earliest_latest(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  find_by_processDefinitionKey(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  empty_result_when_deploymentSpec_has_no_match(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  find_by_versionTag(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  find_by_version(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  find_by_deploymentSpec_source(org.camunda.bpm.extension.migration.ProcessDefinitionFinderTest): No ProcessEngine found to be registered with ProcessEngines!
  org.camunda.bpm.extension.migration.plan.step.variable.VariableStepTest: (..)
  org.camunda.bpm.extension.migration.plan.step.variable.VariableDeleteStepTest: (..)
  org.camunda.bpm.extension.migration.plan.step.model.ModelStepTest: (..)
  org.camunda.bpm.extension.migration.MigratorTest: (..)
Tests run: 24, Failures: 0, Errors: 10, Skipped: 0
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for pom/camunda-bpm-migration-parent 1.1-SNAPSHOT:
[INFO]
[INFO] pom/camunda-bpm-migration-parent ................... SUCCESS [  0.004 s]
[INFO] lib/camunda-bpm-migration .......................... FAILURE [  9.066 s]
[INFO] example/camunda-bpm-migration-examples ............. SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  10.312 s
[INFO] Finished at: 2021-03-31T11:38:51Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12.4:test (default-test) on project camunda-bpm-migration: There are test failures.

[lwille]

@jangalinski, do you have an idea why the tests seem to be environment-dependent?
I could also reproduce the error inside a Google Cloud Shell environment (running Debian 10), however it's working well on my local Fedora machine.