Replace Travis and build with GitHub Actions

.github/workflows/build.yml

@@ -0,0 +1,74 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
+
+jobs:
+  # typical build with various feature combinations
+  build:
+    name: Build
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        flags:
+          - ""
+          - "--features serde"
+          - "--features plugins"
+          - "--features unchecked"
+          - "--features sync"
+          - "--features no_optimize"
+          - "--features no_float"
+          - "--features only_i32"
+          - "--features only_i64"
+          - "--features no_index"
+          - "--features no_object"
+          - "--features no_function"
+          - "--features no_module"
+        toolchain: [stable]
+        experimental: [false]
+        include:
+          # smoketests for future and experimental toolchains
+          - {toolchain: stable, os: windows-latest, experimental: false, flags: ""}
+          - {toolchain: stable, os: macos-latest, experimental: false, flags: ""}
+          - {toolchain: beta, os: ubuntu-latest, experimental: false, flags: ""}
+          - {toolchain: nightly, os: ubuntu-latest, experimental: true, flags: ""}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{matrix.toolchain}}
+        override: true
+    - name: Test
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --all {{matrix.flags}}
+  # no-std builds are a bit more extensive to test
+  no_std_build:
+    name: NoStdBuild
+    runs-on: ${{matrix.os}}
+    # TODO: remove once build works.
+    continue-on-error: true
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+        override: true
+    - name: Build Project
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --manifest-path=no_std/no_std_test/Cargo.toml