[8.x] Fix uri and ironbank docker distribution build (elastic#126004)

Fixes a merge conflict in our docker file used for building docker based distributions

Author: breskeby

distribution/docker/src/docker/Dockerfile

@@ -232,6 +232,10 @@ RUN groupadd -g 1000 elasticsearch && \
     adduser -G elasticsearch -u 1000 elasticsearch -D --home /usr/share/elasticsearch elasticsearch && \
     adduser elasticsearch root && \
     chown -R 0:0 /usr/share/elasticsearch
+<% } else { %>
+RUN groupadd -g 1000 elasticsearch && \\
+    adduser -u 1000 -g 1000 -G 0 -d /usr/share/elasticsearch elasticsearch && \\
+    chown -R 0:0 /usr/share/elasticsearch
 <% } %>
 
 ENV ELASTIC_CONTAINER true