travis: Re-enable s390x

.travis.yml

@@ -72,14 +72,12 @@ jobs:
         FILE_ENV="./ci/test/00_setup_env_arm.sh"
         QEMU_USER_CMD=""
 
-# s390 build was disabled temporarily because of disk space issues on the Travis VM
-#
-#    - stage: test
-#      name: 'S390x  [GOAL: install]  [buster]  [unit tests, functional tests]'
-#      arch: s390x  # Can disable QEMU_USER_CMD and run the tests natively without qemu
-#      env: >-
-#        FILE_ENV="./ci/test/00_setup_env_s390x.sh"
-#        QEMU_USER_CMD=""
+    - stage: test
+      name: 'S390x  [GOAL: install]  [buster]  [unit tests, functional tests]'
+      arch: s390x  # Can disable QEMU_USER_CMD and run the tests natively without qemu
+      env: >-
+        FILE_ENV="./ci/test/00_setup_env_s390x.sh"
+        QEMU_USER_CMD=""
 
     - stage: test
       name: 'Win64  [GOAL: deploy]  [unit tests, no gui, no functional tests]'