ci(actions): improve rust workflow

.github/workflows/rust.yml

@@ -5,25 +5,36 @@ on:
   pull_request:
 
 jobs:
-  clippy:
-    name: Clippy ${{ matrix.os }}
+  test:
+    name: Test ${{ matrix.os }} ${{ matrix.toolchain }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os:
-          - ubuntu-latest
-          - macOS-latest
+        include:
+          - os: ubuntu-latest
+            toolchain: stable
+          - os: macOS-latest
+            toolchain: stable
+
+          - os: ubuntu-latest
+            toolchain: nightly
+          # - os: ubuntu-latest
+          #   toolchain: 1.41.1 # Debian 10 Buster
+          - os: ubuntu-latest
+            toolchain: 1.47.0 # Alpine 3.13
+          - os: ubuntu-latest
+            toolchain: 1.48.0 # Debian 11 Bullseye
     steps:
       - uses: actions/checkout@v2
 
       - name: Setup Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          components: clippy
           override: true
           profile: minimal
-          components: clippy
+          toolchain: ${{ matrix.toolchain }}
 
       - name: Run clippy
         uses: actions-rs/cargo@v1
@@ -31,29 +42,6 @@ jobs:
           command: clippy
           args: --verbose --all-targets --all-features -- -D clippy::all -D clippy::pedantic
 
-  test:
-    name: Test ${{ matrix.os }} ${{ matrix.toolchain }}
-    runs-on: ${{ matrix.os }}
-    needs: clippy
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          - macOS-latest
-        toolchain:
-          - stable
-          - nightly
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Setup Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: ${{ matrix.toolchain }}
-          profile: minimal
-          override: true
-
       - name: Run tests
         uses: actions-rs/cargo@v1
         with:
@@ -87,10 +75,10 @@ jobs:
       - name: Setup Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
           override: true
           profile: minimal
           target: ${{ matrix.triple }}
+          toolchain: stable
 
       - name: Build release
         uses: actions-rs/cargo@v1