Update gitlab-ci

correct lint errors

.gitlab-ci.yml

@@ -5,7 +5,6 @@ variables:
   GIT_DEPTH: "3"
   SIMPLECOV: "true" 
   RUST_BACKTRACE: "1"
-  RUSTFLAGS: "-D warnings"
 cache:
   key: "$CI_BUILD_NAME/$CI_BUILD_REF_NAME"
   untracked: true
@@ -122,6 +121,7 @@ linux-armv7:
   stage: build
   image: ethcore/rust-armv7:latest
   only:
+    - master
     - beta
     - tags
     - stable
@@ -150,6 +150,7 @@ linux-arm:
   stage: build
   image: ethcore/rust-arm:latest
   only:
+    - master
     - beta
     - tags
     - stable
@@ -178,6 +179,7 @@ linux-armv6:
   stage: build
   image: ethcore/rust-armv6:latest
   only:
+    - master
     - beta
     - tags
     - stable
@@ -206,6 +208,7 @@ linux-aarch64:
   stage: build
   image: ethcore/rust-aarch64:latest
   only:
+    - master
     - beta
     - tags
     - stable