Add -DskipUI for most tests

We don't need to build the UI for mosts tests.

Author: rschlussel

.github/workflows/tests.yml

@@ -8,8 +8,8 @@ env:
   CONTINUOUS_INTEGRATION: true
   MAVEN_OPTS: "-Xmx1024M -XX:+ExitOnOutOfMemoryError"
   MAVEN_INSTALL_OPTS: "-Xmx2G -XX:+ExitOnOutOfMemoryError"
-  MAVEN_FAST_INSTALL: "-B -V --quiet -T 1C -DskipTests -Dair.check.skip-all --no-transfer-progress -Dmaven.javadoc.skip=true"
-  MAVEN_TEST: "-B -Dair.check.skip-all -Dmaven.javadoc.skip=true -DLogTestDurationListener.enabled=true --no-transfer-progress --fail-at-end"
+  MAVEN_FAST_INSTALL: "-B -V --quiet -T 1C -DskipTests -Dair.check.skip-all --no-transfer-progress -Dmaven.javadoc.skip=true -DskipUI"
+  MAVEN_TEST: "-B -Dair.check.skip-all -Dmaven.javadoc.skip=true -DLogTestDurationListener.enabled=true --no-transfer-progress --fail-at-end -DskipUI"
   RETRY: .github/bin/retry
 
 jobs: