fix(ci): remove drizzle-kit push and add BETTER_AUTH_SECRET for E2E

Since b73d7a0 added auto-migrate on Node platform boot, the explicit
drizzle-kit push step conflicts — push creates tables without recording
a migration journal, so the subsequent migrate() call fails with
"table already exists". Also add BETTER_AUTH_SECRET env var required
since ff1ad78 added fail-fast on missing secret.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -27,6 +27,8 @@ jobs:
     name: E2E Tests
     runs-on: ubuntu-latest
     needs: check
+    env:
+      BETTER_AUTH_SECRET: ci-test-secret-that-is-at-least-32-chars
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
@@ -34,7 +36,6 @@ jobs:
           node-version: 24
           cache: npm
       - run: npm ci
-      - run: npx drizzle-kit push
       - run: npx playwright install --with-deps chromium
       - run: npm run e2e
       - uses: actions/upload-artifact@v4