fix(ci): save the Next.js build cache every run instead of freezing it at the lockfile key (#5859)

* fix(ci): save the Next.js build cache every run instead of freezing it at the lockfile key

The cache key was only runner.os + bun.lock hash, and GitHub caches are
immutable per key: the first run after a lockfile change saved the cache
once, then every later run hit the primary key and skipped the save
('Cache hit occurred on the primary key ... not saving cache'), so builds
compiled against a cache stale since the last lockfile bump. Suffix the
key with the commit SHA so each run saves its refreshed cache, and
restore via prefix match to the most recent entry.

* fix(ci): make the Next.js cache key unique per run attempt so reruns can save too

Author: waleedlatif1

.github/workflows/test-build.yml

@@ -236,12 +236,20 @@ jobs:
           key: ${{ github.repository }}-turbo-cache-build-${{ github.event_name }}${{ github.event.pull_request.head.repo.fork && '-fork' || '' }}
           path: ./.turbo
 
+      # Keyed per commit so EVERY run saves its refreshed cache — a key without
+      # a unique suffix is written once and then frozen (GitHub caches are
+      # immutable per key; a primary-key hit skips the save), which left builds
+      # compiling against a cache stale since the last lockfile change. The
+      # restore-keys prefix match picks the most recently saved cache for this
+      # lockfile, falling back across lockfile changes.
       - name: Restore Next.js build cache
         uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: ./apps/sim/.next/cache
-          key: ${{ runner.os }}-nextjs-${{ hashFiles('bun.lock') }}
+          key: ${{ runner.os }}-nextjs-${{ hashFiles('bun.lock') }}-${{ github.sha }}-${{ github.run_id }}-${{ github.run_attempt }}
           restore-keys: |
+            ${{ runner.os }}-nextjs-${{ hashFiles('bun.lock') }}-${{ github.sha }}-
+            ${{ runner.os }}-nextjs-${{ hashFiles('bun.lock') }}-
             ${{ runner.os }}-nextjs-
 
       - name: Install dependencies