ci: add dispatch-nightly-build workflow

.github/README.md

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+# Workflows
+
+## Create Personal Access Token (PAT):
+
+- Login on GitHub as vitelabs-bot
+- Go to https://github.com/settings/tokens
+- Generate new token
+- Note: WORKFLOW_PUBLIC_REPO
+- Expiration: No expiration
+- Select scopes: repo -> public_repo
+
+## Add repo secret
+
+- Go to Settings -> Secrects -> Actions
+- New repository secret
+- Name: WORKFLOW_PUBLIC_REPO_PAT
+- Value: ghp_...

.github/workflows/dispatch-nightly-build.yml

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+name: dispatch-nightly-build
+
+on:
+  push:
+    branches:    
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Read buildversion
+      id: buildversion
+      uses: juliangruber/read-file-action@v1
+      with:
+        path: ./version/buildversion
+
+    - name: Echo buildversion
+      # trim buildversion and set environment variable
+      run: echo "${{ steps.buildversion.outputs.content }}" | xargs | echo "buildversion=$(</dev/stdin)" >> $GITHUB_ENV 
+
+    - name: Repository Dispatch
+      uses: peter-evans/repository-dispatch@v2
+      with:
+        token: ${{ secrets.WORKFLOW_PUBLIC_REPO_PAT }}
+        repository: vitelabs/go-vite-nightly
+        event-type: nightly-build-event
+        client-payload: '{"branch": "master", "tag": "${{ env.buildversion }}"}'