Add a workflow to create PD PR manually (#953)

.github/workflows/manual-create-pd-pr.yaml

@@ -0,0 +1,69 @@
+name: Create PD PR Manually
+
+on:
+  workflow_dispatch:
+    inputs:
+      release_version:
+        description: "Release version, e.g. v2021.07.09.1"
+        required: true
+
+jobs:
+  pd_pr:
+    name: Create PD PR
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out PD code base
+        uses: actions/checkout@master
+        with:
+          repository: tikv/pd
+      - uses: actions/setup-go@v2
+        with:
+          go-version: "1.16.5"
+      - name: Update TiDB Dashboard in PD code base
+        run: |
+          go get -d "github.com/pingcap/tidb-dashboard@${{ github.event.inputs.release_version }}"
+          go mod tidy
+          make pd-server
+          go mod tidy
+      - name: Commit PD code base change
+        id: git_commit
+        run: |
+          git config user.name "tidb-dashboard-bot"
+          git config user.email "[email protected]"
+          git add go.mod go.sum
+          if git status | grep -q "Changes to be committed"
+          then
+            git commit --signoff --message "Update TiDB Dashboard to ${{ github.event.inputs.release_version }}"
+            echo "::set-output name=committed::1"
+          else
+            echo "No changes detected, skipped"
+          fi
+      - name: Set build ID
+        id: build_id
+        run: echo "::set-output name=id::$(date +%s)"
+      - name: Create PR based on PD code base
+        uses: peter-evans/create-pull-request@v3
+        if: steps.git_commit.outputs.committed == 1
+        with:
+          token: ${{ secrets.BOT_PAT }}
+          branch: update-tidb-dashboard/${{ github.event.inputs.release_version }}-${{ steps.build_id.outputs.id }}
+          title: Update TiDB Dashboard to ${{ github.event.inputs.release_version }}
+          body: |
+            ### What problem does this PR solve?
+
+            Update TiDB Dashboard to ${{ github.event.inputs.release_version }}.
+
+            Upstream commit: https://github.com/${{ github.repository }}/commit/${{ github.sha }} .
+
+            ### Check List
+
+            Related changes
+
+            - Need to cherry-pick to the release branch
+
+            ### Release note
+
+            ```release-note
+            Update TiDB Dashboard to ${{ github.event.inputs.release_version }}
+            ```
+          push-to-fork: tidb-dashboard-bot/pd