Update the build to install slapd before slapd-contrib, since apt-get was hitting a race condition when they were both selected for install at the same time.

Dockerfile

@@ -6,7 +6,8 @@ LABEL description="OpenLDAP" \
       version="Ubuntu 24.04"
 
 # Install the necessary packages for LDAP Proxy server
-RUN apt-get -q update && apt-get install -q --yes slapd slapd-contrib ldap-utils
+RUN apt-get -q update && apt-get install -q --yes slapd
+RUN apt-get -q update && apt-get install -q --yes slapd-contrib ldap-utils
 
 # Remove the slapd.d directory, since we will be using slapd.conf.
 RUN rm -rf /etc/ldap/slapd.d