Add GitHub workflows

.github/workflows/build.yml

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+name: build
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.13.x, 1.14.x, 1.15.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      GO111MODULE: "on"
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Download Go modules
+        run: go mod download
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test ./...
+
+      - name: Coverage
+        env:
+          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          go test -race -covermode atomic -coverprofile=profile.cov ./...
+          GO111MODULE=off go get github.com/mattn/goveralls
+          $(go env GOPATH)/bin/goveralls -coverprofile=profile.cov -service=github
+        if: matrix.go-version == '1.15.x' && matrix.os == 'ubuntu-latest'

.github/workflows/lint.yml

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+name: lint
+on: [push, pull_request]
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
+          version: v1.30
+          # Optional: golangci-lint command line arguments.
+          args: --issues-exit-code=0
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          only-new-issues: true

.golangci.yml

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+run:
+  tests: false
+
+issues:
+  max-issues-per-linter: 0
+  max-same-issues: 0
+
+linters:
+  enable:
+    - bodyclose
+    - dupl
+    - exportloopref
+    - goconst
+    - godot
+    - godox
+    - goimports
+    - gomnd
+    - goprintffuncname
+    - gosec
+    - misspell
+    - prealloc
+    - rowserrcheck
+    - sqlclosecheck
+    - unconvert
+    - unparam
+    - whitespace