Migrate aufs subproject to GitHub Actions CI

Signed-off-by: Phil Estes <estesp@amazon.com>

.github/workflows/ci.yml

@@ -0,0 +1,85 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  checks:
+    name: Project Checks
+    runs-on: ubuntu-18.04
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.16.2
+
+      - name: Set env
+        shell: bash
+        run: |
+          echo "GOPATH=${{ github.workspace }}" >> $GITHUB_ENV
+          echo "${{ github.workspace }}/bin" >> $GITHUB_PATH
+
+      - uses: actions/checkout@v2
+        with:
+          path: src/github.com/containerd/aufs
+          fetch-depth: 25
+
+      - uses: containerd/project-checks@v1
+        with:
+          working-directory: src/github.com/containerd/aufs
+
+  linters:
+    name: Linters
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+
+    strategy:
+      matrix:
+        go-version: [1.16.2]
+        os: [ubuntu-18.04]
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          path: src/github.com/containerd/aufs
+
+      - name: Set env
+        shell: bash
+        run: |
+          echo "GOPATH=${{ github.workspace }}" >> $GITHUB_ENV
+          echo "${{ github.workspace }}/bin" >> $GITHUB_PATH
+
+      - uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.29
+          working-directory: src/github.com/containerd/aufs
+
+  tests:
+    name: Tests
+    runs-on: ubuntu-18.04
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          path: src/github.com/containerd/aufs
+
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.16.2
+
+      - name: Set env
+        shell: bash
+        run: |
+          echo "GOPATH=${{ github.workspace }}" >> $GITHUB_ENV
+          echo "${{ github.workspace }}/bin" >> $GITHUB_PATH
+
+      - run: |
+          go test -v -race -covermode=atomic -coverprofile=coverage.txt ./...
+          bash <(curl -s https://codecov.io/bash)
+        working-directory: src/github.com/containerd/aufs