Add workflow for surge preview

Sadly, by definition, this cannot be tested from the pull request, so I will have to push and hope.

Author: holly-cummins

.github/workflows/build_and_publish.yml

@@ -37,7 +37,12 @@ jobs:
       - run: npm run test:int
         env:
           CI: true
-
+      - name: Publishing directory for PR preview
+        uses: actions/upload-artifact@v2
+        with:
+          name: site
+          path: ./public
+          retention-days: 3
   deploy:
     # Only try and deploy on merged code
     if: "github.repository == 'quarkusio/extensions' && github.ref_name == 'main' && (github.event_name == 'push' || github.event_name == 'schedule')"

.github/workflows/preview.yml

@@ -0,0 +1,48 @@
+name: Surge PR Preview
+
+on:
+  workflow_run:
+    workflows: [ "Gatsby Publish" ]
+    types:
+      - completed
+
+jobs:
+  preview:
+    runs-on: ubuntu-20.04
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: Download PR Artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: ${{ github.event.workflow_run.workflow_id }}
+          workflow_conclusion: success
+          name: site
+      - name: Store PR id as variable
+        id: pr
+        run: |
+          echo "id=$(<pr-id.txt)" >> $GITHUB_OUTPUT 
+          rm -f pr-id.txt
+      - name: Publishing to surge for preview
+        id: deploy
+        run: npx surge ./ --domain https://extensions-quarkus-io-pr-${{ steps.pr.outputs.id }}-preview.surge.sh --token ${{ secrets.SURGE_TOKEN }}
+      - name: Update PR status comment on success
+        uses: actions-cool/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            🚀 PR Preview ${{ github.sha }} has been successfully built and deployed to https://quarkus-io-pr-${{ steps.pr.outputs.id }}-preview.surge.sh
+            <img width="300" src="https://user-images.githubusercontent.com/507615/90250366-88233900-de6e-11ea-95a5-84f0762ffd39.png">
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'
+          number: ${{ steps.pr.outputs.id }}
+      - name: Update PR status comment on failure
+        if: ${{ failure() }}
+        uses: actions-cool/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            😭 Deploy PR Preview failed.
+            <img width="300" src="https://user-images.githubusercontent.com/507615/90250824-4e066700-de6f-11ea-8230-600ecc3d6a6b.png">
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'
+          number: ${{ steps.pr.outputs.id }}