try cross-platform testing based on cross-platform binary builds

.github/workflows/cross-platform-testing.yml

@@ -0,0 +1,74 @@
+name: release
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+jobs:
+  build-release:
+    name: test
+    runs-on: ${{ matrix.os }}
+    env:
+      # For some builds, we use cross to test on 32-bit and big-endian
+      # systems.
+      CARGO: cargo
+      # When CARGO is set to CROSS, this is set to `--target matrix.target`.
+      TARGET_FLAGS:
+      # When CARGO is set to CROSS, TARGET_DIR includes matrix.target.
+      TARGET_DIR: ./target
+      # Emit backtraces on panics.
+      RUST_BACKTRACE: 1
+    strategy:
+      matrix:
+        build: [linux, linux-arm, macos, win-msvc, win-gnu, win32-msvc]
+        include:
+          - build: linux
+            os: ubuntu-18.04
+            rust: nightly
+            target: x86_64-unknown-linux-musl
+          - build: linux-arm
+            os: ubuntu-18.04
+            rust: nightly
+            target: arm-unknown-linux-gnueabihf
+          - build: macos
+            os: macos-latest
+            rust: nightly
+            target: x86_64-apple-darwin
+          - build: win-msvc
+            os: windows-2019
+            rust: nightly
+            target: x86_64-pc-windows-msvc
+          - build: win-gnu
+            os: windows-2019
+            rust: nightly-x86_64-gnu
+            target: x86_64-pc-windows-gnu
+          - build: win32-msvc
+            os: windows-2019
+            rust: nightly
+            target: i686-pc-windows-msvc
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          profile: minimal
+          override: true
+          target: ${{ matrix.target }}
+
+      - name: Show command used for Cargo
+        if: success()
+        run: |
+          echo "cargo command is: ${{ env.CARGO }}"
+          echo "target flag is: ${{ env.TARGET_FLAGS }}"
+          echo "target dir is: ${{ env.TARGET_DIR }}"
+
+      - name: Run tests
+        if: success()
+        run: ${{ env.CARGO }} test ${{ env.TARGET_FLAGS }}
+