ci: simplify preview alias derivation

Use `git rev-parse --short=8 HEAD` for the preview alias in deploy:preview,
and dedupe the CI side: the meta step now emits a single `sha` output and
the alias is built inline as `preview-<sha>`, dropping the duplicate alias
output and env var.

Assisted-by: ClaudeCode:claude-opus-4-8

Author: Flowm

.github/workflows/ci.yml

@@ -51,32 +51,28 @@ jobs:
       - id: meta
         env:
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-        run: |
-          echo "sha=${HEAD_SHA:0:8}" >> "$GITHUB_OUTPUT"
-          echo "alias=preview-${HEAD_SHA:0:8}" >> "$GITHUB_OUTPUT"
+        run: echo "sha=${HEAD_SHA:0:8}" >> "$GITHUB_OUTPUT"
       # Upload a new Worker version without promoting it to production. The
-      # --preview-alias mints a stable URL (<sha>-audiotrail.<subdomain>.workers.dev).
+      # --preview-alias mints a stable URL (preview-<sha>-audiotrail.<subdomain>.workers.dev).
       - id: preview
         uses: cloudflare/wrangler-action@ebbaa1584979971c8614a24965b4405ff95890e0 # v4.0.0
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           packageManager: pnpm
-          command: versions upload --preview-alias ${{ steps.meta.outputs.alias }}
+          command: versions upload --preview-alias preview-${{ steps.meta.outputs.sha }}
       - uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         env:
           PREVIEW_URL: ${{ steps.preview.outputs.deployment-url }}
-          ALIAS: ${{ steps.meta.outputs.alias }}
           SHA: ${{ steps.meta.outputs.sha }}
         with:
           script: |
             const marker = '<!-- audiotrail-preview -->';
             // wrangler-action returns the per-version URL (https://<8-hex>-<worker>.<sub>.workers.dev);
             // swap the version prefix for our commit alias to get the URL deploy:preview reproduces.
-            const versionUrl = process.env.PREVIEW_URL;
-            const alias = process.env.ALIAS;
             const sha = process.env.SHA;
-            const aliasUrl = versionUrl && alias
-              ? versionUrl.replace(/^https:\/\/[0-9a-f]{8}-/, `https://${alias}-`)
+            const versionUrl = process.env.PREVIEW_URL;
+            const aliasUrl = versionUrl
+              ? versionUrl.replace(/^https:\/\/[0-9a-f]{8}-/, `https://preview-${sha}-`)
               : '';
             const body = [
               marker,

package.json

@@ -13,7 +13,7 @@
     "lint": "oxlint && oxfmt --check && vue-tsc",
     "lint:fix": "oxlint --fix && oxfmt --write",
     "deploy": "pnpm build && wrangler deploy",
-    "deploy:preview": "pnpm build && wrangler versions upload --preview-alias preview-$(git rev-parse HEAD | head -c 8)"
+    "deploy:preview": "pnpm build && wrangler versions upload --preview-alias preview-$(git rev-parse --short=8 HEAD)"
   },
   "dependencies": {
     "@fontsource-variable/fraunces": "^5.2.9",