Corrections to the ldap-account-manager container.

- ldap-account-manager is not available on Debian buster right now, use
Debian sid instead.
- Document the default password.

ldap-account-manager/Dockerfile

-FROM debian:buster-slim
+FROM debian:sid-slim
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
         ldap-account-manager\

ldap-account-manager/README.md

@@ -7,4 +7,5 @@
 The image isn't configured with environment variables, instead it uses a volume
 for `/var/lib/ldap-account-manager` that contains the application's
 configuration files. On first run the default files are copied to the volume and
-the configuration is done through the application itself.
+the configuration is done through the application itself. The default master
+password is `lam`.

ldap-account-manager/entrypoint

 #!/bin/sh
 set -eux
 
-chown root:root /var/lib/ldap-account-manager
-chmod 755 /var/lib/ldap-account-manager
+install -d -m 755 -o root -g root /var/lib/ldap-account-manager
 cp --archive --no-clobber --verbose --no-target-directory /var/lib/ldap-account-manager.orig /var/lib/ldap-account-manager
 eval exec "$@"