Merge #20072: ci: Build Arm64 on Travis without functional tests

33df8d46bb ci: Build Arm64 on Travis without functional tests (Fabian Jahr)

Pull request description:

  The Travis Arm64 env is a pretty big PITA for quite a while now. It simply seems to time out due to a lack of resources as far as I can tell from my research into the matter.

  I have reported the issue in August and received no response: https://travis-ci.community/t/arm64-failing-without-message/9775. Others have complained about similar issues with Arm64 over the past year. The explanation for this is probably that this env is still considered to be in beta: https://docs.travis-ci.com/user/multi-cpu-architectures.

  Considering the high frequency of failures (I didn't run any numbers, just based on my personal observations) and the beta status I would suggest that we shorten the runtime by removing part of the test suite until the env is more stable. I would suggest removing functional tests since it should help for sure but maybe there are other ideas.

ACKs for top commit:
  MarcoFalke:
    ACK 33df8d46bb

Tree-SHA512: 55b0c658b526611d16a26e9508611ddeecbfbd842ec064ada61d188a8be2f473e080c2a35746a9aae8006b11b0c2ab9dd4639b0f3004ecf821506e26c7345972

ci/test/00_setup_env_arm.sh

@@ -21,7 +21,7 @@ export CONTAINER_NAME=ci_arm_linux
 export DOCKER_NAME_TAG="debian:buster"
 export USE_BUSY_BOX=true
 export RUN_UNIT_TESTS=true
-export RUN_FUNCTIONAL_TESTS=true
+export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
 # -Wno-psabi is to disable ABI warnings: "note: parameter passing for argument of type ... changed in GCC 7.1"
 # This could be removed once the ABI change warning does not show up by default