Right now I've got

yaml
      - name: Deploy preview to Cloudflare
        uses: cloudflare/pages-action@1
        id: pages-action
        with:
          apiToken: ${{ secrets.CI_CF_PAGES }}
          accountId: ${{ secrets.CF_ACCOUNT_ID }}
          projectName: ${{ env.PAGES_PROJECT_NAME }}
          directory: dist
          gitHubToken: ${{ secrets.GITHUB_TOKEN }}

      - name: Comment PR
        uses: thollander/actions-comment-pull-request@v2
        with:
          message: |
            id: ${{ steps.pages-action.outputs.id }}
            url: ${{ steps.pages-action.outputs.url }}
            alias: ${{ steps.pages-action.outputs.alias }}
            environment: ${{ steps.pages-action.outputs.environment }}
          comment_tag: deployment
          mode: upsert

Or—I see, right now I'm not creating a branch preview URL, am I. Hence why

alias

is just the URL

For anyone who finds this via search, it looks like there are a number of issues with

cloudflare/pages-action

that prevent this from working, as noted in the issues for the repo: a) one needs to manually set the deployment branch to

${{ github.head_ref || github.ref_name }}

even though the documentation suggests you don't, and b) even if you do,

outputs.alias

doesn't work. The wrangler action is way more updated (supports pnpm, for one), and you can use

command: pages deploy

with it, but it doesn't output the branch URL (or make a github deployment?) either. For now I just faked the whole thing:

yaml
      - name: Deploy preview to Cloudflare
        uses: cloudflare/pages-action@1
        id: pages-action
        with:
          apiToken: ${{ secrets.CI_CF_PAGES }}
          accountId: ${{ secrets.CF_ACCOUNT_ID }}
          projectName: ${{ env.PAGES_PROJECT_NAME }}
          directory: dist
          branch: ${{ github.head_ref || github.ref_name }} 
          gitHubToken: ${{ secrets.GITHUB_TOKEN }}

      - name: Comment PR
        uses: thollander/actions-comment-pull-request@v2
        with:
          message: |
            Deployed ${{ steps.pages-action.outputs.environment }} build to Cloudflare!

            |                         |   |
            | ----------------------- | - |
            | **Last commit:**        | ${{ github.event.pull_request.head.sha || github.event.workflow_run.head_sha || github.sha }} |
            | **Preview URL**:        | ${{ steps.pages-action.outputs.url }} |
            | **Branch Preview URL**: | https://${{ github.head_ref || github.ref_name }}.${{ env.PAGES_PROJECT_NAME }}.pages.dev |
          comment_tag: deployment
          mode: upsert