ci-s390x: Add qemu and depends support in the ci script

Author: elichai

.travis.yml

@@ -93,6 +93,7 @@ jobs:
       arch: s390x
       env: >-
         FILE_ENV="./ci/test/00_setup_env_s390x.sh"
+        QEMU_USER_CMD=""  # Can run the tests natively without qemu
 
     - stage: test
       name: 'Win64  [GOAL: deploy]  [unit tests, no gui, no functional tests]'

ci/test/00_setup_env_s390x.sh

@@ -6,9 +6,11 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=s390x-unknown-linux-gnu
-export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
-export NO_DEPENDS=1
+export HOST=s390x-linux-gnu
+# The host arch is unknown, so we run the tests through qemu.
+# If the host is s390x and wants to run the tests natively, it can set QEMU_USER_CMD to the empty string.
+export QEMU_USER_CMD="${QEMU_USER_CMD:"qemu-s390x"}"
+export PACKAGES="python3-zmq bsdmainutils qemu-user"
 export RUN_UNIT_TESTS=true
 export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"