Add github actions workflow

.github/scripts/build.bash

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Script for building your rust projects.
+set -e
+
+source .github/scripts/common.bash
+
+# $1 {path} = Path to cross/cargo executable
+CROSS=$1
+# $1 {string} = <Target Triple> e.g. x86_64-pc-windows-msvc
+TARGET_TRIPLE=$2
+# $3 {boolean} = Are we building for deployment? 
+RELEASE_BUILD=$3
+
+required_arg $CROSS 'CROSS'
+required_arg $TARGET_TRIPLE '<Target Triple>'
+
+if [ -z "$RELEASE_BUILD" ]; then
+    $CROSS build --target $TARGET_TRIPLE
+else
+    $CROSS build --target $TARGET_TRIPLE --release
+fi

.github/scripts/common.bash

@@ -0,0 +1,6 @@
+required_arg() {
+    if [ -z "$1" ]; then
+        echo "Required argument $2 missing"
+        exit 1
+    fi
+}

.github/scripts/set_rust_version.bash

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+#!/usr/bin/env bash
+set -e
+rustup default $1
+rustup target add $2

.github/scripts/test.bash

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+#!/usr/bin/env bash
+# Script for building your rust projects.
+set -e
+
+source .github/scripts/common.bash
+
+# $1 {path} = Path to cross/cargo executable
+CROSS=$1
+# $1 {string} = <Target Triple>
+TARGET_TRIPLE=$2
+
+required_arg $CROSS 'CROSS'
+required_arg $TARGET_TRIPLE '<Target Triple>'
+
+$CROSS test --target $TARGET_TRIPLE

.github/workflows/build.yml

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+name: build
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+
+jobs:
+  install-cross:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 50
+      - uses: XAMPPRocky/get-github-release@v1
+        id: cross
+        with:
+          owner: rust-embedded
+          repo: cross
+          matches: ${{ matrix.platform }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/upload-artifact@v1
+        with:
+          name: cross-${{ matrix.platform }}
+          path: ${{ steps.cross.outputs.install_path }}
+    strategy:
+      matrix:
+        platform: [ linux-musl, apple-darwin ]
+
+  windows:
+    runs-on: windows-latest
+    needs: install-cross
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+      - run: .github/scripts/set_rust_version.bash ${{ matrix.channel }} ${{ matrix.target }}
+        shell: bash
+      - run: .github/scripts/build.bash cargo ${{ matrix.target }}
+        shell: bash
+      - run: .github/scripts/test.bash cargo ${{ matrix.target }}
+        shell: bash
+
+    strategy:
+      matrix:
+        channel: [ stable, beta ]
+        target:
+          - x86_64-pc-windows-gnu
+          - x86_64-pc-windows-msvc
+
+  macos:
+    runs-on: macos-latest
+    needs: install-cross
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+
+      - uses: actions/download-artifact@v1
+        with:
+          name: cross-apple-darwin
+          path: /usr/local/bin/
+
+      - run: chmod +x /usr/local/bin/cross
+
+      - run: .github/scripts/set_rust_version.bash ${{ matrix.channel }} ${{ matrix.target }}
+      - run: .github/scripts/build.bash cross ${{ matrix.target }}
+      - run: .github/scripts/test.bash cross ${{ matrix.target }}
+        if: matrix.target == 'x86_64-apple-darwin'
+
+    strategy:
+      matrix:
+        channel: [ stable, beta ]
+        target:
+          - x86_64-apple-darwin
+
+  linux:
+    runs-on: ubuntu-latest
+    needs: install-cross
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+
+      - name: Download Cross
+        uses: actions/download-artifact@v1
+        with:
+          name: cross-linux-musl
+          path: /tmp/
+      - run: chmod +x /tmp/cross
+      - run: .github/scripts/set_rust_version.bash ${{ matrix.channel }} ${{ matrix.target }}
+      - run: .github/scripts/build.bash /tmp/cross ${{ matrix.target }}
+      - run: .github/scripts/test.bash /tmp/cross ${{ matrix.target }}
+        if: |
+          !contains(matrix.target, 'android') &&
+          !contains(matrix.target, 'bsd') &&
+          !contains(matrix.target, 'solaris') &&
+          matrix.target != 'armv5te-unknown-linux-musleabi' &&
+          matrix.target != 'sparc64-unknown-linux-gnu'
+
+    strategy:
+      matrix:
+        channel: [ stable, beta ]
+        target:
+          - x86_64-unknown-linux-gnu
+          - x86_64-unknown-linux-musl