adds frozen-lockfile to yarn install (#1197)

Co-authored-by: JP Engstrom <jpengstrom@MacBook-Pro.local>

Author: jpengst

Dockerfile

@@ -23,7 +23,7 @@ COPY  --chown=app . $APP_HOME
 # cached pages / assets to be kept and cleaned the way Rails expects them to be while keeping deployment very fast.
 # The assets/packs get copied back by rsync on app load (see ops/nginx.sh)
 RUN /sbin/setuser app bash -l -c " \
-    DB_ADAPTER=nulldb yarn install --ignore-scripts && \
+    DB_ADAPTER=nulldb yarn install --frozen-lockfile --ignore-scripts && \
     yarn run uv-install && yarn run uv-config && \
     bundle exec rake assets:precompile && \
     mv ./public/assets ./public/assets-new && \