Merge pull request #4223 from hmlnarik/KEYCLOAK-4189-Cross-DC-testing

KEYCLOAK-4189 Fix in instructions for running Cross-DC tests

testsuite/integration-arquillian/HOW-TO-RUN.md

@@ -431,7 +431,11 @@ The cross DC requires setting a profile specifying used cache server (currently
 
 #### Run Cross-DC Tests from Maven
 
-Run the following command (adjust the test specification according to your needs):
+First compile the Infinispan test server via the following command:
+
+  `mvn -Pcache-server-infinispan -f testsuite/integration-arquillian -DskipTests clean install`
+
+Then you can run the tests using the following command (adjust the test specification according to your needs):
 
   `mvn -Pcache-server-infinispan -Dtest=*.crossdc.* -pl testsuite/integration-arquillian/tests/base test`
 

testsuite/integration-arquillian/servers/cache-server/jboss/infinispan/src/.dont-delete

@@ -0,0 +1 @@
+This file is to mark this Maven project as a valid option for building cache server artifact