add github action build

.github/workflows/build.yml

+name: build
+on: [push,pull_request]
+
+jobs:
+  check_fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: Intsall Golangci-lint
+        run: |
+          # add executables installed with go get to PATH
+          # TODO: this will hopefully be fixed by
+          # https://github.com/actions/setup-go/issues/14
+          export PATH=${PATH}:`go env GOPATH`/bin
+          go get -u golang.org/x/tools/cmd/goimports
+          go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.18.0
+          go get -u mvdan.cc/sh/cmd/shfmt
+          go get -u mvdan.cc/sh/cmd/gosh
+
+      - name: Lint
+        run: |
+          make checkgofmt && make fmt_go
+          make linter
+
+  unit-test:
+    name: unit-test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: unit-test
+        run: make test
+
+  coverage:
+    name: coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: ut coverage
+        run: make coverage
+      - name: cover report
+        if: success()
+        run: bash <(curl -s https://codecov.io/bash)
+
+  autotest:
+    name: autotest
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: deploy
+        run: |
+          make build_ci
+          make autotest dapp=all
+
+  ci_base:
+    name: ci_base
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: deploy
+        run: |
+          make build_ci
+          make docker-compose && make docker-compose-down
+
+  ci_paracross:
+    name: ci_paracross
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: deploy
+        run: |
+          make build_ci
+          make docker-compose dapp=paracross
+          make docker-compose-down dapp=paracross
+
+  ci_x2ethereum:
+    name: ci_paracross
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Golang
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13
+        id: go
+      - name: set go env
+        run: export PATH=${PATH}:`go env GOPATH`/bin
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: deploy
+        run: |
+          make docker-compose dapp=x2ethereum
+          make docker-compose-down dapp=x2ethereum
+