Add phpLDAPadmin service for LDAP user management

Accessible at localhost:8085 (configurable via FORWARD_PHPLDAPADMIN_PORT).
Login with cn=admin,dc=travel,dc=local and the LDAP admin password.

compose.yaml

@@ -115,6 +115,17 @@ services:
                 - '${LDAP_ADMIN_PASSWORD:-adminpassword}'
             retries: 3
             timeout: 5s
+    phpldapadmin:
+        image: 'osixia/phpldapadmin:latest'
+        ports:
+            - '${FORWARD_PHPLDAPADMIN_PORT:-8085}:80'
+        environment:
+            PHPLDAPADMIN_LDAP_HOSTS: openldap
+            PHPLDAPADMIN_HTTPS: 'false'
+        networks:
+            - sail
+        depends_on:
+            - openldap
 networks:
     sail:
         driver: bridge