ci: stop docker build records and cap artifact retention

Disable build-push-action build record uploads in publish-server-image;
they are large and unused by the digest publish flow. Digest artifacts
already expire after one day. Set seven-day retention on desktop e2e
screenshots so CI debug uploads do not inherit the org default.

Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>

.github/workflows/ci.yml

@@ -134,6 +134,7 @@ jobs:
           name: desktop-e2e-screenshots
           path: apps/desktop/e2e/screenshots
           if-no-files-found: ignore
+          retention-days: 7
 
   test:
     name: Unit tests

.github/workflows/publish-server-image.yml

@@ -27,6 +27,8 @@ permissions:
 env:
   # docker/metadata-action otherwise truncates commit tags to seven collision-prone characters.
   DOCKER_METADATA_SHORT_SHA_LENGTH: 40
+  # build-push-action v6 uploads large *.dockerbuild records by default; publish only needs digest artifacts.
+  DOCKER_BUILD_RECORD_UPLOAD: false
 
 concurrency:
   group: publish-server-image-${{ github.ref }}