add ldap to docker

deploy/build_env/services-linux/Dockerfile

@@ -28,6 +28,7 @@ RUN set -eux; \
 		nginx-light \
 		mongodb-org-server \
 	; \
+	DEBIAN_FRONTEND=noninteractive apt-get install -y slapd; \
 	rm -rf /var/lib/apt/lists/*
 
 RUN curl -fsSL https://raw.githubusercontent.com/mongodb/mongo/master/debian/init.d > /etc/init.d/mongod
@@ -73,6 +74,7 @@ telemetry = {\n\
 RUN echo "\n\
 /usr/bin/nomad agent -config /etc/nomad.d &> /dev/null &\n\
 /usr/bin/consul agent -config-dir=/etc/consul.d/ &> /dev/null &\n\
+service slapd start\n\
 service mongod start\n\
 " > /services_start.sh