Add GitHub Actions workflows for preview deployments and production deploy

- Add preview.yml: creates a Worker Preview on every PR using wrangler preview
  (prerelease from cloudflare/workers-sdk#12983), posts/updates a PR comment
  with the preview URL
- Add deploy.yml: runs npm run deploy on pushes to main
- Update wrangler to prerelease version from pkg.pr.new/wrangler@12983
- Replace deploy:preview script to call wrangler preview after build
- Remove vite preview script (superseded by wrangler preview)

Author: maxwellpeterson

.github/workflows/deploy.yml

@@ -0,0 +1,32 @@
+# Deploys the Worker to production on pushes to main
+#
+# Required secret: CLOUDFLARE_API_TOKEN
+# Add it at: Settings → Secrets and variables → Actions → New repository secret
+
+name: Deploy
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Deploy
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+        run: npm run deploy

.github/workflows/preview.yml

@@ -0,0 +1,82 @@
+# Creates a Worker Preview deployment on pull requests
+#
+# Required secret: CLOUDFLARE_API_TOKEN
+# Add it at: Settings → Secrets and variables → Actions → New repository secret
+
+name: Preview
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Deploy preview
+        id: preview
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+        run: |
+          output=$(npm run deploy:preview 2>&1)
+          echo "$output"
+          # Extract the preview URL from wrangler output (https://*.workers.dev or similar)
+          url=$(echo "$output" | grep -oP 'https://[^\s"]+\.workers\.dev[^\s"]*' | head -1)
+          if [ -n "$url" ]; then
+            echo "url=$url" >> "$GITHUB_OUTPUT"
+          fi
+          echo "output<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$output" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+
+      - name: Post preview comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const url = `${{ steps.preview.outputs.url }}`;
+            const rawOutput = `${{ steps.preview.outputs.output }}`;
+
+            const body = url
+              ? `### Preview deployment\n\n${url}`
+              : `### Preview deployment\n\n<details><summary>wrangler output</summary>\n\n\`\`\`\n${rawOutput}\n\`\`\`\n\n</details>`;
+
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+
+            const existing = comments.find(c =>
+              c.user.login === 'github-actions[bot]' &&
+              c.body.startsWith('### Preview deployment')
+            );
+
+            if (existing) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+                body,
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body,
+              });
+            }