ci: Run only the nextjs-15 E2E test (temporary, do not merge)

Limits the E2E jobs to one app while we try the Playwright container on
Namespace runners.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: JPeer264

.github/workflows/build.yml

@@ -1007,7 +1007,9 @@ jobs:
       E2E_APP_DIR: /tmp/test-application
     strategy:
       fail-fast: false
-      matrix: ${{ fromJson(needs.job_build.outputs.e2e-matrix) }}
+      matrix:
+        include:
+          - test-application: nextjs-15
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v7
@@ -1125,7 +1127,7 @@ jobs:
     # We need to add the `always()` check here because the previous step has this as well :(
     # See: https://github.com/actions/runner/issues/2205
     if:
-      always() && needs.job_get_metadata.outputs.is_release != 'true' && needs.job_build_tarballs.result == 'success' &&
+      false && always() && needs.job_get_metadata.outputs.is_release != 'true' && needs.job_build_tarballs.result == 'success' &&
       needs.job_build.outputs.e2e-matrix-optional != '{"include":[]}' && (github.event_name != 'pull_request' ||
       github.event.pull_request.head.repo.full_name == github.repository) && github.actor != 'dependabot[bot]'
     needs: [job_get_metadata, job_build, job_build_tarballs]