fix: user login and creation with LDAP (#2107)

* Corrected if statement to check if a results was returned by the LDAP search. And decoded the user_attributes from binary data to string

* removed trailing spaces

* Revert asserts in LDAP unit test back

Since an empty tuple is still a result, an user is created and the result should not be false.

* Simplified code

* Extended the LDAP implementation

* fix ldap authentication and user creation

* modified docs to include new LDAP environment variables

* update tests and linting

* add libldap-2.4-2 as runtime dependency for the api

---------

Co-authored-by: Erik Landkroon <eriklandkroon@gmail.com>

docker/api.Dockerfile

@@ -72,6 +72,7 @@ RUN apt-get update \
     && apt-get install --no-install-recommends -y \
     gosu \
     tesseract-ocr-all \
+    libldap-2.4-2 \
     && apt-get autoremove \
     && rm -rf /var/lib/apt/lists/*
 

docker/omni.Dockerfile

@@ -97,6 +97,7 @@ RUN apt-get update \
     tesseract-ocr-all \
     curl \
     gnupg \
+    libldap-2.4-2 \
     && apt-get autoremove \
     && rm -rf /var/lib/apt/lists/*