Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -19,6 +19,17 @@ build:
 #    paths:
 #      - ./.build/ 
 
+build-linux:
+  stage: build
+
+  script:
+    - swiftly install latest
+    - swift build -c release -Xswiftc -cross-module-optimization
+  tags:
+    - linux
+
+  allow_failure: true # Don't hold things up until we get this working
+
 
 test:
   stage: test