feat: Add CronJob manifest for ldap-sync

[Revanee]

The manifest will run docker-oss.nexus.famedly.de/famedly-sync-agent:v0.4.0 once per day at 00:00 in the namespace ldap-sync. It requires a ConfigMap named famedly-sync to be present in the ldap-sync namespace. It can be created using kubectl create configmap --from-file config.yaml famedly-sync --namespace ldap-sync.

Closes #39

[nikzen]

Would it be possible to also add a chapter to the readme? :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.94%. Comparing base (3d725da) to head (629df56).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   86.94%   86.94%           
=======================================
  Files           7        7           
  Lines        1310     1310           
=======================================
  Hits         1139     1139           
  Misses        171      171           

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