make linting a separate job from tests

.github/workflows/test.yml

@@ -7,7 +7,7 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -17,9 +17,19 @@ jobs:
         toolchain: stable
         profile: minimal
         override: true
-    - name: Install Clippy
-      run: rustup component add clippy
-    - name: Run linter
-      run: cargo clippy -- -D warnings
     - name: Run tests
       run: cargo test
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+      - name: Install Clippy
+        run: rustup component add clippy
+      - name: Run linter
+        run: cargo clippy -- -D warnings