Add Comment on PR to preview

.github/workflows/deploy-preview.yml

@@ -42,6 +42,7 @@ jobs:
       - run: unzip build.zip -d build
 
       - name: Deploy preview to Cloudflare Pages
+        id: deploy
         uses: cloudflare/pages-action@v1
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
@@ -50,3 +51,21 @@ jobs:
           directory: build
           gitHubToken: ${{ secrets.GITHUB_TOKEN }} # GitHub Deployments
           wranglerVersion: '3'
+
+      - name: 'Comment on PR'
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const fs = require('fs');
+            try {
+              const issue_number = Number(fs.readFileSync('./build/PR_NR'));
+              await github.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issue_number,
+                body: "Preview URL: ${{ steps.deploy.outputs.alias }}"
+              });
+            } catch (err) {
+              console.log(err);
+            }