disable fail fast and add ICU

Author: rmottola

.github/workflows/main.yml

@@ -21,6 +21,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
 
     strategy:
+      fail-fast: false
       matrix:
         include:
           - server: x11
@@ -35,6 +36,7 @@ jobs:
         build-essential
         git
         pkg-config
+        icu-devel
         libtiff-dev
         libjpeg-dev
         libgnustep-base-dev