feat: add slapd package version

Author: BertrandGouny

README.md

@@ -4,7 +4,7 @@
 [![Docker Stars](https://img.shields.io/docker/stars/osixia/openldap.svg)](https://hub.docker.com/r/osixia/openldap/)
 [![Layers](https://images.microbadger.com/badges/image/osixia/openldap.svg)](https://hub.docker.com/r/osixia/openldap/)
 
-Latest release: 1.5.0 - [OpenLDAP 2.4.50](https://www.openldap.org/software/release/changes.html) -  [Changelog](CHANGELOG.md) | [Docker Hub](https://hub.docker.com/r/osixia/openldap/) 
+Latest release: 1.5.0 - [OpenLDAP 2.4.57](https://www.openldap.org/software/release/changes.html) -  [Changelog](CHANGELOG.md) | [Docker Hub](https://hub.docker.com/r/osixia/openldap/) 
 
 **A docker image to run OpenLDAP.**
 

image/Dockerfile

@@ -1,6 +1,8 @@
 # Use osixia/light-baseimage
 # sources: https://github.com/osixia/docker-light-baseimage
-FROM osixia/light-baseimage:1.3.1
+FROM osixia/light-baseimage:1.3.2
+
+ARG SLAPD_PACKAGE_VERSION=2.4.57+dfsg-1~bpo10+1
 
 ARG LDAP_OPENLDAP_GID
 ARG LDAP_OPENLDAP_UID
@@ -32,7 +34,7 @@ RUN echo "path-include /usr/share/doc/krb5*" >> /etc/dpkg/dpkg.cfg.d/docker && a
     libsasl2-modules-otp \
     libsasl2-modules-sql \
     openssl \
-    slapd \
+    slapd=${SLAPD_PACKAGE_VERSION} \
     slapd-contrib \
     krb5-kdc-ldap \
     && curl -o pqchecker.deb -SL http://www.meddeb.net/pub/pqchecker/deb/8/pqchecker_${PQCHECKER_VERSION}_amd64.deb \