feat: Versioning for airflow-operator (#725)

* wip:ssh for gitsync

* linting, use deploy key

* change credentials fields in line with operator-rs

* regenerate charts

* bring enum in line with framework definition

* bring enum in line with framework definition: correction

* missed files

* switch gitsync to v2

* wip: airflow versioning

* remove version prefix from airflow config

* use hint instead of explicit functions

* chore: Add missing label to Deployment

* restore test to v1alpha1

* added versioning integration test

* updated to operator-rs 101.1

* fix: Downgrade k8s-openapi to 0.26.0 to prevent CRD schema bug

* regenerate nix and charts

* update branch commit refs

* bump operator-rs, minor test fixes

* remove standalone dag-processor role due to race condition

* review feedback

* adjust makefile and tiltfile for crd treatment

* remove now-redundant crd file

* revert version changes

* bump operator-rs to 0.103.0

---------

Co-authored-by: Techassi <git@techassi.dev>
Co-authored-by: Sebastian Bernauer <sebastian.bernauer@stackable.tech>

Author: 3 people

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+- Add operator versioning ([#725]).
+  - GitSync considered for v1alpha1 and v1alpha2
 - Support objectOverrides using `.spec.objectOverrides`.
   See [objectOverrides concepts page](https://docs.stackable.tech/home/nightly/concepts/overrides/#object-overrides) for details ([#726]).
 
@@ -17,6 +19,7 @@
 - Prevent unnecessary Pod restarts when initially creating an AirflowCluster.
   This is achieved by applying the StatefulSet after all ConfigMaps and Secrets that it mounts ([#734]).
 
+[#725]: https://github.com/stackabletech/airflow-operator/pull/725
 [#726]: https://github.com/stackabletech/airflow-operator/pull/726
 [#727]: https://github.com/stackabletech/airflow-operator/pull/727
 [#733]: https://github.com/stackabletech/airflow-operator/pull/733