Set default value for phpLDAPadmin to use ldapi as the ldap host.

docker-compose.yml

@@ -19,7 +19,6 @@ services:
         volumes:
             - _run_ldap:/run/slapd
         environment:
-            PLA_HOST: ldapi://%2frun%2fslapd%2fldapi
             PLA_BASE_DN: 'dc=nowhere,dc=com'
             PLA_BIND_ID: 'cn=admin,dc=nowhere,dc=com'
         ports:

phpldapadmin/Dockerfile

@@ -6,5 +6,6 @@ RUN apk add --update --no-cache phpldapadmin php5-apache2 php5-openssl && \
 
 COPY --chown=root:root config.php /usr/share/webapps/phpldapadmin/config/
 COPY --chown=root:root phpldapadmin.conf /etc/apache2/conf.d/
+ENV PLA_HOST=ldapi://%2frun%2fslapd%2fldapi
 CMD [ "httpd", "-DFOREGROUND" ]
 HEALTHCHECK CMD wget --spider --quiet http://localhost/htdocs/index.php || exit 1