diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..ffb9c12
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,51 @@
+name: go
+
+on:
+  schedule:
+    - cron: '50 10 * * *'
+
+jobs:
+  go:
+    runs-on: ubuntu-16.04
+    strategy:
+      matrix:
+        branch: [master, release-branch.go1.20, release-branch.go1.19, release-branch.go1.18]
+        goos: [linux, windows, darwin]
+        goarch: [amd64, arm64]
+    steps:
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+          check-latest: true
+      - name: Setup
+        run: |
+          sudo DEBIAN_FRONTEND=noninteractive apt install -yq golang pigz bzip2
+      - name: Clone
+        run: |
+          git clone -b ${{ matrix.branch }} https://go.googlesource.com/go
+          sudo mv go /opt/
+      - name: Patch
+        run: |
+          wget https://github.com/phuslu/go/raw/master/01-dot-goenv.patch
+          patch -p1 -d /opt/go < 01-dot-goenv.patch
+      - name: Make
+        run: |
+          cd /opt/go/src
+          cgo_enabled=$(test "${{ matrix.goos }}_${{ matrix.goarch }}" = "linux_amd64" && echo 1 || echo 0)
+          env CGO_ENABLED=${cgo_enabled} GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} ./make.bash
+      - name: Tarball
+        run: |
+          cd /opt/go/bin
+          test -d ${{ matrix.goos }}_${{ matrix.goarch }} && rm -f go gofmt && mv -f ${{ matrix.goos }}_${{ matrix.goarch }}/* . && rmdir ${{ matrix.goos }}_${{ matrix.goarch }}
+          cd /opt
+          gover=$(echo ${{ matrix.branch }} | grep -oP 'go1.+' || echo gotip)
+          tar -cf /tmp/${gover}.${{ matrix.goos }}-${{ matrix.goarch }}.tar go
+          pigz -9 /tmp/${gover}.${{ matrix.goos }}-${{ matrix.goarch }}.tar
+      - name: Release
+        run: |
+          curl -L https://github.com/github-release/github-release/releases/download/v0.10.0/linux-amd64-github-release.bz2 | bzip2 -d >github-release
+          chmod +x github-release
+          gover=$(echo ${{ matrix.branch }} | grep -oP 'go1.+' || echo gotip)
+          ./github-release upload --replace --user phuslu --repo go --tag v0.0.0 --name ${gover}.${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz --file /tmp/${gover}.${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GOTIP_TOKEN }}
diff --git a/01-dot-goenv.patch b/01-dot-goenv.patch
new file mode 100644
index 0000000..3658e0f
--- /dev/null
+++ b/01-dot-goenv.patch
@@ -0,0 +1,62 @@
+commit 33fda521f72037473a9153266a28e2dedc510f02
+Author: phus.lu <phus.lu@gmail.com>
+Date:   2022-06-17 23:49:02 +0800
+
+    go/build: add .goenv support
+
+diff --git a/src/go/build/build.go b/src/go/build/build.go
+index 420873c256..c038380bc9 100644
+--- a/src/go/build/build.go
++++ b/src/go/build/build.go
+@@ -351,6 +351,51 @@ func defaultContext() Context {
+ 		c.CgoEnabled = false
+ 	}
+ 
++	if os.Getenv("GOENV_ENABLED") == "1" {
++		dir, _ := os.Getwd()
++		var lines []string
++		for i := 0; i < 6; i++ {
++			if data, _ := os.ReadFile(filepath.Join(dir, ".goenv")); len(data) != 0 {
++				lines = strings.Split(string(data), "\n")
++				break
++			}
++			if dir = filepath.Dir(dir); dir == "/" {
++				break
++			}
++		}
++		for _, line := range lines {
++			parts := strings.SplitN(line, "=", 2)
++			if len(parts) == 1 || strings.HasPrefix(strings.TrimSpace(line), "#") {
++				continue
++			}
++			key := strings.TrimSpace(parts[0])
++			value := strings.TrimSpace(parts[1])
++			os.Setenv(key, value)
++			switch key {
++			case "CGO_ENABLED":
++				switch value {
++				case "1":
++					c.CgoEnabled = true
++				case "0":
++					c.CgoEnabled = false
++				}
++			case "GOOS":
++				c.GOOS = value
++			case "GOARCH":
++				c.GOARCH = value
++			case "GOPATH":
++				c.GOPATH = value
++			case "GOROOT":
++				c.GOROOT = value
++			case "http_proxy":
++				os.Setenv("http_proxy", value)
++				os.Setenv("https_proxy", value)
++				os.Setenv("HTTP_PROXY", value)
++				os.Setenv("HTTPS_PROXY", value)
++			}
++		}
++	}
++
+ 	return c
+ }
+ 
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3f3ea02
--- /dev/null
+++ b/README.md
@@ -0,0 +1,33 @@
+## go daily builds
+
+### gotip
+- [gotip.linux-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.linux-amd64.tar.gz)
+- [gotip.linux-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.linux-arm64.tar.gz)
+- [gotip.windows-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.windows-amd64.tar.gz)
+- [gotip.windows-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.windows-arm64.tar.gz)
+- [gotip.darwin-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.darwin-amd64.tar.gz)
+- [gotip.darwin-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/gotip.darwin-arm64.tar.gz)
+
+### go1.20
+- [go1.20.linux-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.linux-amd64.tar.gz)
+- [go1.20.linux-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.linux-arm64.tar.gz)
+- [go1.20.windows-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.windows-amd64.tar.gz)
+- [go1.20.windows-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.windows-arm64.tar.gz)
+- [go1.20.darwin-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.darwin-amd64.tar.gz)
+- [go1.20.darwin-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.20.darwin-arm64.tar.gz)
+
+### go1.19
+- [go1.19.linux-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.linux-amd64.tar.gz)
+- [go1.19.linux-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.linux-arm64.tar.gz)
+- [go1.19.windows-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.windows-amd64.tar.gz)
+- [go1.19.windows-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.windows-arm64.tar.gz)
+- [go1.19.darwin-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.darwin-amd64.tar.gz)
+- [go1.19.darwin-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.19.darwin-arm64.tar.gz)
+
+### go1.18
+- [go1.18.linux-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.linux-amd64.tar.gz)
+- [go1.18.linux-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.linux-arm64.tar.gz)
+- [go1.18.windows-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.windows-amd64.tar.gz)
+- [go1.18.windows-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.windows-arm64.tar.gz)
+- [go1.18.darwin-amd64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.darwin-amd64.tar.gz)
+- [go1.18.darwin-arm64.tar.gz](https://github.com/phuslu/go/releases/download/v0.0.0/go1.18.darwin-arm64.tar.gz)