Fixed tag doc generation

.github/workflows/tag_docs.yml

@@ -6,11 +6,19 @@ on:
  
 jobs:
   docs:
+    env:
+      ORIGIN_SITE: _origin_site
+      TAGS_DIR: tags
+      BRANCH_DIR: branch
     name: Generate docs
     runs-on: windows-latest
     steps:
       - name: Configure git
-        run: git config --global core.autocrlf true
+        shell: powershell
+        run: |
+          git config --global core.autocrlf true
+          git config --global user.email (($env:GITHUB_ACTOR,"@users.noreply.github.com") -join "")
+          git config --global user.name $env:GITHUB_ACTOR
       - name: Checkout branch
         uses: actions/checkout@v2
       - name: Checkout submodules
@@ -25,22 +33,48 @@ jobs:
         uses: crazy-max/ghaction-chocolatey@v1
         with:
           args: install docfx -y
+      - name: Checkout current pages
+        uses: actions/checkout@v2
+        with:
+          ref: gh-pages
+          token: ${{ secrets.pagesCommitToken }}
+          path: docs/${{ env.ORIGIN_SITE }}
       - name: Build docs
-        env: 
-          SOURCE_COMMIT: ${{ github.sha }}
         shell: powershell
         working-directory: ./docs
         run: |
-          Add-Content link_branch.json "{`"_gitContribute`":{`"sourceBranch`":`"$env:SOURCE_COMMIT`",`"apiSpecFolder`":`"docs/override`"}}"
+          Add-Content link_branch.json "{`"_gitContribute`":{`"sourceBranch`":`"$env:GITHUB_SHA`",`"apiSpecFolder`":`"docs/override`"}}"
           powershell .\build.ps1
           if ($lastexitcode -ne 0){
               throw [System.Exception] "docfx build failed with exit code $lastexitcode."
           }
-      - name: Publish tag site to GitHub pages
-        uses: seanmiddleditch/gha-publish-to-git@master
-        with:
-          branch: gh-pages
-          github-token: ${{ secrets.pagesCommitToken }}
-          source_folder: docs/_site
-          target_folder: tags/${{ github.ref }}
+     - name: Publish tag site to GitHub pages
+        shell: powershell
+        working-directory: ./docs
+        run: |
+          $ErrorActionPreference = "Continue"
+
+          $tagName = (git rev-parse --abbrev-ref=loose $env:GITHUB_REF) -join ""
+
+          cd $env:ORIGIN_SITE
+          
+          if (-Not (Test-Path $env:TAGS_DIR)) {
+            New-Item -ItemType directory -Path $env:TAGS_DIR
+          }
+
+          $tagPath = "$env:TAGS_DIR/$tagName"
+          if (Test-Path $tagPath) {
+            # force remove it
+            Get-ChildItem -Path $tagPath -Recurse | Remove-Item -Force -Recurse
+            Remove-Item $tagPath -Force
+          }
+              
+          # move generated into place
+          Move-Item ../_site $tagPath
+
+          git add -A 2>&1
+
+          git commit -q -a -m "Saved tag $tagName"
+          
+          git push -q origin gh-pages