fix: lookup user by name, not id

Previously, the `id -u $LOCAL_USER_ID` check would succeed, because there was already a user mapped to the $LOCAL_USER_ID with a different name.

Looking up the entry in the database by name, however, correctly makes the `useradd` operation idempotent. An alternative fix would be to avoid duplicating an already-existing-ID, however that would require either probing for an available ID or identifying where LOCAL_USER_ID is being set and changing it to better match the ubuntu base image, neither of which is a one-line change.

Author: sethp

Diff for: src/ci/run.sh

@@ -8,7 +8,7 @@ fi
 
 if [ "$NO_CHANGE_USER" = "" ]; then
   if [ "$LOCAL_USER_ID" != "" ]; then
-    id -u $LOCAL_USER_ID &>/dev/null || useradd --shell /bin/bash -u $LOCAL_USER_ID -o -c "" -m user
+    id -u user &>/dev/null || useradd --shell /bin/bash -u $LOCAL_USER_ID -o -c "" -m user
     export HOME=/home/user
     unset LOCAL_USER_ID