Migrate from Travis CI to GitHub Actions

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

.gitattributes

@@ -0,0 +1,2 @@
+*.go text eol=lf
+

.github/workflows/ci.yaml

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+name: Go
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.17.1
+
+    - name: Setup gotestsum
+      uses: autero1/action-gotestsum@v1.0.0
+      with:
+        gotestsum_version: 1.7.0
+
+    - name: Test
+      run: gotestsum --format short-verbose -- -race -timeout=20m -coverprofile=coverage_txt -covermode=atomic ./...
+
+    - uses: codecov/codecov-action@v2
+      with:
+        files: coverage_txt
+
+  lint:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: golangci/golangci-lint-action@v2
+      with:
+        args: --timeout=5m