feat: add python ldap3

Dockerfile

@@ -40,7 +40,7 @@ RUN apk add --no-cache --virtual=build-dependencies \
         python3 \
         py3-pip \
     && python -m venv /venv \
-    && /venv/bin/pip install --no-cache-dir radicale==$VERSION passlib[bcrypt] pytz \
+    && /venv/bin/pip install --no-cache-dir radicale==$VERSION passlib[bcrypt] pytz ldap3 \
     && apk del --purge build-dependencies \
     && addgroup -g $BUILD_GID radicale \
     && adduser -D -s /bin/false -H -u $BUILD_UID -G radicale radicale \

README.md

@@ -52,7 +52,10 @@ Enhanced Docker image for <a href="https://radicale.org">Radicale</a>, the CalDA
 * :closed_lock_with_key: **Secured**: the container is read-only, with only access to its data dir, and without extraneous privileges
 * :fire: **Safe**: run as a normal user (not root)
 * :building_construction: **Multi-architecture**: run on amd64 and arm64
-* :sparkles: **Batteries included**: git and ssh included for [versioning](https://github.com/tomsquest/docker-radicale/#versioning-with-git) and Pytz/tz-data for proper timezone handling
+* :sparkles: **Batteries included**: 
+  * git and ssh included for [versioning](https://github.com/tomsquest/docker-radicale/#versioning-with-git)
+  * Python ldap3 for [LDAP authentication](https://github.com/Kozea/Radicale/wiki/LDAP-authentication)
+  * Python pytz for proper timezone handling
 
 ## Changelog