github: upgrade rust action

.github/workflows/rust.yml

@@ -1,43 +1,50 @@
-on: push
+on: [push]
 
 name: Continuous integration
 
 jobs:
-  ci:
+  test:
+    name: Test Suite
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - stable
-          - beta
-          - nightly
-
     steps:
-      - uses: actions/checkout@v1
-
+      - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: ${{ matrix.rust }}
+          toolchain: stable
           override: true
-          components: rustfmt, clippy
-
-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --release
-
       - uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --release
 
+  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: actions-rs/cargo@v1
         with:
           command: fmt
           args: --all -- --check
 
-      # - uses: actions-rs/cargo@v1
-      #   with:
-      #     command: clippy
-      #     args: -- -D warnings
+  clippy:
+    name: Clippy
+    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 clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings