chore: update dispatch for latest docs site

Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>

Author: g1eny0ung

.github/workflows/dispatch.yml

@@ -1,29 +1,26 @@
-name: Repsitory dispatch workflow from docs-dm-master
+name: Trigger docs site update
 
 on:
   push:
     branches:
       - master
+      - release-*
 
 jobs:
-  build:
+  trigger:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+      - name: Extract sha
+        id: extract
+        shell: bash
+        run: |
+          echo "::set-output name=sha::$(sha=${{ github.sha }}; echo ${sha:0:6})"
 
-    - name: Extract branch, repo and sha
-      shell: bash
-      id: extract_info
-      run: |
-        echo "::set-output name=branch::${GITHUB_REF#refs/heads/}"
-        echo "::set-output name=repo::$(cut -d'/' -f2 <<< ${{ github.repository }})"
-        echo "::set-output name=sha::$(sha=${{ github.sha }}; echo ${sha:0:6})"
-
-    # - name: Repository Dispatch
-    #   uses: peter-evans/repository-dispatch@v1.1.1
-    #   with:
-    #       token: ${{ secrets.PR_TRIGGER_BUILD_TOKEN }}
-    #       repository: pingcap/website-docs/
-    #       event-type: ${{ steps.extract_info.outputs.repo }}/${{ steps.extract_info.outputs.branch }}-${{ steps.extract_info.outputs.sha }}
-    #       client-payload: '{"ref": "${{ github.ref }}", "sha": "${{ github.sha }}", "repo": "${{ github.repository }}"}'
+      - name: Repository Dispatch
+        uses: peter-evans/repository-dispatch@v1
+        with:
+          token: ${{ secrets.PR_TRIGGER_BUILD_TOKEN }}
+          repository: pingcap/website-docs
+          event-type: ${{ github.repository }}/${{ github.ref_name }}-${{ steps.extract.outputs.sha }}
+          client-payload: '{ "repo": "${{ github.repository }}", "ref": "${{ github.ref_name }}", "sha": "${{ github.sha }}" }'