Add Deploy preview workflow

.github/workflows/deploy-preview.yml

@@ -0,0 +1,51 @@
+# Deploy preview to Cloudflare Pages
+name: Deploy preview
+
+on:
+  workflow_run:
+    workflows: ["Build preview"]
+    types:
+      - completed
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+
+    permissions:
+      contents: read
+      deployments: write
+
+    steps:
+      - name: Download artifact
+        uses: actions/github-script@v3.1.0
+        with:
+          script: |
+            const artifacts = await github.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            const matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "build"
+            })[0];
+            const download = await github.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchArtifact.id,
+               archive_format: 'zip',
+            });
+            const fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/build.zip', Buffer.from(download.data));
+      - run: unzip build.zip
+
+      - name: Deploy preview to Cloudflare Pages
+        uses: cloudflare/pages-action@v1
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          projectName: wiki
+          directory: build
+          wranglerVersion: '3'