Fix diff link comment (#768)

.github/workflows/shadow-repo-build.yml

@@ -28,13 +28,18 @@ jobs:
           name: site
           path: site.tar
 
-  diff-link:
-    name: Comment
+  prep-diff-link:
+    name: Prep comment
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request' && github.event.action == 'opened'
     steps:
-      - uses: peter-evans/create-or-update-comment@v3
-        with:
-          issue-number: ${{ github.event.number }}
-          body: |
+      - name: Save comment
+        env:
+          COMMENT: |
             View diff of compiled files (may take a few minutes): https://github.com/${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}/compare/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.ref }}
+        run: |
+          echo $COMMENT > ./comment.txt
+      - uses: actions/upload-artifact@v3
+        with:
+          name: comment
+          path: comment.txt

.github/workflows/shadow-repo-update.yml

@@ -45,27 +45,49 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'workflow_run'
     steps:
-      - name: Clone shadow repo
-        uses: actions/checkout@v3
-        with:
-          repository: ${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}
-          token: ${{ secrets.SASS_SITE_TOKEN }}
-          ref: ${{ github.ref_name }}
-          path: shadow-repo
       - name: Download built site
         uses: dawidd6/action-download-artifact@v2.27.0
         with:
           name: site
           run_id: ${{ github.event.workflow_run.id }}
+          if_no_artifact_found: ignore
+      - name: Clone shadow repo
+        uses: actions/checkout@v3
+        if: steps.download_comment.outputs.found_artifact == 'true'
+        with:
+          repository: ${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}
+          token: ${{ secrets.SASS_SITE_TOKEN }}
+          ref: ${{ github.ref_name }}
+          path: shadow-repo
       - name: Update shadow repo files
+        if: steps.download_comment.outputs.found_artifact == 'true'
         run: |
           rm -rf shadow_repo/*
           tar xf site.tar
           cp -rT _site shadow_repo
       - uses: EndBug/add-and-commit@v9
+        if: steps.download_comment.outputs.found_artifact == 'true'
         with:
           cwd: shadow-repo
           author_name: Sass Bot
           author_email: sass.bot.beep.boop@gmail.com
           message: Update from https://github.com/${{ github.repository }}/commit/${{ github.sha }}
           commit: --allow-empty
+
+  diff-link:
+    name: Comment
+    runs-on: ubuntu-latest
+    if: github.event_name == 'workflow_run'
+    steps:
+      - name: Download comment text
+        id: download_comment
+        uses: dawidd6/action-download-artifact@v2.27.0
+        with:
+          name: comment
+          run_id: ${{ github.event.workflow_run.id }}
+          if_no_artifact_found: ignore
+      - uses: peter-evans/create-or-update-comment@v3
+        if: steps.download_comment.outputs.found_artifact == 'true'
+        with:
+          issue-number: ${{ github.event.number }}
+          body_path: comment.txt