Add GitHub Action Workflow for CI

This commit adds a GitHub Actions workflow to replace both CircleCI and
LinuxKit CI.

It will build the Linuxkit binary, run tests and upload artifacts

It replaces the Integration Tests that are run by Linuxkit CI via
the make ci or make ci-pr targets with multiple sets of Integration
Tests that are run in parallel.

It does not yet test GCP. The GCP test in LinuxKit CI could be moved to RTF

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>

.github/workflows/build.yml

@@ -0,0 +1,181 @@
+name: LinuxKit CI
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build & Test
+    strategy:
+      matrix:
+        arch:
+          - amd64-linux
+          - arm64-linux
+          - s390x-linux
+          - amd64-darwin
+          - amd64-windows.exe
+
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.11
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.11
+      id: go
+
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Get pre-requisites
+      run: |
+            echo "::set-env name=PATH::$PATH:$(go env GOPATH)/bin"
+            go get -u golang.org/x/lint/golint
+            go get -u github.com/gordonklaus/ineffassign
+      env:
+        GOPATH: ${{runner.workspace}}
+
+    - name: Lint
+      run: |
+        make local-check
+      env:
+        GOPATH: ${{runner.workspace}}
+
+    - name: Build
+      run: |
+        make LOCAL_TARGET=bin/linuxkit-${{matrix.arch}} local-build
+      env:
+        GOPATH: ${{runner.workspace}}
+
+    - name: Checksum
+      run: cd bin && sha256sum linuxkit-${{matrix.arch}} > linuxkit-${{matrix.arch}}.SHA256SUM
+
+    - name: Test
+      run: make local-test
+      env:
+        GOPATH: ${{runner.workspace}}
+
+    - name: Upload binary
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: linuxkit-${{matrix.arch}}
+        path: bin
+
+  build_packages:
+    name: Build Packages
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        make
+        sudo make install
+
+    - name: Build Packages
+      run: |
+        make -C pkg build
+
+  test_packages:
+    name: Packages Tests
+    needs: [ build_packages, build ]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        DEBIAN_FRONTEND=noninteractive sudo apt-get install -qy expect
+        make
+        sudo make install
+
+    - name: Run Tests
+      run: |
+        cd test
+        rtf -l build -v run -x linuxkit.packages
+
+  test_kernel:
+    name: Kernel Tests
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        make
+        sudo make install
+
+    - name: Run Tests
+      run: |
+        cd test
+        rtf -l build -v run -x linuxkit.kernel
+
+  test_linuxkit:
+    name: LinuxKit Build Tests
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        make
+        sudo make install
+
+    - name: Run Tests
+      run: |
+        cd test
+        rtf -l build -v run -x linuxkit.build
+
+  test_platforms:
+    name: Platform Tests
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        make
+        sudo make install
+
+    - name: Run Tests
+      run: |
+        cd test
+        rtf -l build -v run -x linuxkit.platforms
+
+  test_security:
+    name: Security Tests
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        path: ./src/github.com/linuxkit/linuxkit
+
+    - name: Install Tools
+      run: |
+        make
+        sudo make install
+
+    - name: Run Tests
+      run: |
+        cd test
+        rtf -l build -v run -x linuxkit.security