chore(ci): update workflow

.github/workflows/rust.yml

@@ -1,11 +1,19 @@
 name: Rust
 
-on: [push]
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - 'master'
+
+env:
+  CARGO_TERM_COLOR: always
 
 jobs:
   build-mac:
     runs-on: macos-latest
-
     steps:
     - uses: actions/checkout@v2
 
@@ -17,9 +25,9 @@ jobs:
         name: copyrat-macos.zip
         path: ./target/release/*copyrat
 
+
   build-linux:
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v2