Update CI

.gitlab-ci.yml

@@ -3,14 +3,15 @@ image: "redoxos/redoxer"
 stages:
     - build
 
-cache:
-    paths:
-        - target/
+workflow:
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "master" && $CI_PROJECT_NAMESPACE == "redox-os"'
+    - if: '$CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "master"'
 
 build:linux:
     stage: build
-    script: cargo +nightly build --verbose
+    script: cargo +nightly build
 
 build:redox:
     stage: build
-    script: redoxer build --verbose
+    script: redoxer build