Test musl and darwin targets

.github/workflows/oxipng.yml

@@ -13,27 +13,44 @@ jobs:
     strategy:
       matrix:
         target:
-          - x86_64-unknown-linux-gnu
-          - x86_64-pc-windows-msvc
+        - x86_64-unknown-linux-gnu
+        - x86_64-unknown-linux-musl
+        - x86_64-pc-windows-msvc
+        - x86_64-apple-darwin
         toolchain:
-          # Minimum stable
-          - "1.41.0"
-          - stable
-          - beta
-          - nightly
+        # Minimum stable
+        - "1.41.0"
+        - stable
+        - beta
+        - nightly
         include:
-          - target: x86_64-unknown-linux-gnu
-            os: ubuntu-latest
-          - target: x86_64-pc-windows-msvc
-            os: windows-latest
+        - target: x86_64-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: x86_64-unknown-linux-musl
+          os: ubuntu-latest
+        - target: x86_64-pc-windows-msvc
+          os: windows-latest
+        - target: x86_64-apple-darwin
+          os: macOS-latest
         exclude:
-          - target: x86_64-pc-windows-msvc
-            rust: beta
-          - target: x86_64-pc-windows-msvc
-            rust: nightly
+        - target: x86_64-pc-windows-msvc
+          rust: beta
+        - target: x86_64-pc-windows-msvc
+          rust: nightly
+        - target: x86_64-apple-darwin
+          rust: beta
+        - target: x86_64-apple-darwin
+          rust: nightly
+        - target: x86_64-unknown-linux-musl
+          rust: beta
+        - target: x86_64-unknown-linux-musl
+          rust: nightly
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
+    - name: Install musl tools
+      run: sudo apt-get install musl-tools
+      if: "contains(matrix.target, 'musl')"
     - name: Install ${{ matrix.toolchain }}
       uses: actions-rs/toolchain@v1
       with: