use v1alpha2, corrected pem mount

Author: adwk67

stacks/airflow/airflow.yaml

@@ -1,6 +1,6 @@
 ---
 # {% raw %}
-apiVersion: airflow.stackable.tech/v1alpha1
+apiVersion: airflow.stackable.tech/v1alpha2
 kind: AirflowCluster
 metadata:
   name: airflow

stacks/airflow/patch_airflow.yaml

@@ -1,5 +1,5 @@
 ---
-apiVersion: airflow.stackable.tech/v1alpha1
+apiVersion: airflow.stackable.tech/v1alpha2
 kind: AirflowCluster
 metadata:
   name: airflow
@@ -9,7 +9,7 @@ spec:
       - name: airflow-dags
         mountPath: /dags/dag_factory.py
         subPath: dag_factory.py
-      - name: kafka-tls-pem
+      - name: tls-pem
         mountPath: /stackable/kafka-tls-pem
   webservers:
     roleGroups: