[web, postorius] Fix libldap installation package group

The libldap package is not installed in the mailman-web:0.5 and
postorius images despite being listed as a dependency in the Dockerfile.
This issue arises because libldap is included in the .build-deps virtual
package group, which is removed at the end of the build process, causing
the package to be uninstalled.

This commit addresses the issue by moving libldap from the .build-deps
virtual package group to the .mailman-rundeps virtual package group in
both the web and postorius Dockerfiles. This ensures that libldap
remains installed in the final image, as it is now part of the runtime
dependencies.

Changes:
- Move libldap installation from .build-deps to .mailman-rundeps in
  postorius/Dockerfile and postorius/Dockerfile.env;
- Move libldap installation from .build-deps to .mailman-rundeps in
  web/Dockerfile and web/Dockerfile.env.

These changes are necessary to ensure that the libldap package is
available in the running containers, preventing runtime errors related
to missing LDAP dependencies.

Signed-off-by: Antonio Rocco <8lue@8lue.xyz>

web/Dockerfile

@@ -9,9 +9,9 @@ COPY requirements.txt /tmp/
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers libldap \
+	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
            postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
-	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata \
+	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata libldap \
 	   postgresql-client mysql-client py3-mysqlclient curl mailcap gettext \
 	   python3 py3-pip xapian-core xapian-bindings-python3 libffi pcre-dev py-cryptography \
 	&& python3 -m pip install --break-system-packages -U 'Django<4.3' pip setuptools wheel \

web/Dockerfile.dev

@@ -11,9 +11,9 @@ ARG CLIENT_REF
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-    && apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers git libldap \
+    && apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers git \
         postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
-    && apk add --no-cache --virtual .mailman-rundeps bash sassc pcre-dev tzdata \
+    && apk add --no-cache --virtual .mailman-rundeps bash sassc pcre-dev tzdata libldap \
         python3 py3-pip postgresql-client mysql-client py3-mysqlclient \
         curl mailcap xapian-core xapian-bindings-python3 libffi gettext py-cryptography \
     && python3 -m pip install --break-system-packages -U pip setuptools wheel \