separate workflow for build and check

.github/workflows/build.yml

@@ -3,8 +3,6 @@ name: Build
 on:
   push:
     branches: [master]
-  pull_request:
-    branches: [master]
 
 jobs:
   build:
@@ -42,19 +40,3 @@ jobs:
           branch: repo
           force: true
           directory: repo
-  fmt:
-    name: rustfmt
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - run: rustup component add rustfmt
-      - uses: Swatinem/rust-cache@v1
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check

.github/workflows/check.yml

@@ -0,0 +1,23 @@
+name: Check
+
+on:
+  pull_request:
+    branches: [master]
+
+jobs:
+  fmt:
+    name: rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: Swatinem/rust-cache@v1
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check