Apply suggestions from code review

Author: NickLarsenNZ

demos/signal-processing/Dockerfile-nifi

@@ -1,5 +1,3 @@
-# docker build -f ./Dockerfile-nifi -t docker.stackable.tech/demos/nifi:1.27.0-postgresql .
-
 FROM docker.stackable.tech/stackable/nifi:1.27.0-stackable24.7.0
 
 RUN curl --fail -o /stackable/nifi/postgresql-42.6.0.jar "https://repo.stackable.tech/repository/misc/postgresql-timescaledb/postgresql-42.6.0.jar"

stacks/data-lakehouse-iceberg-trino-spark/nifi.yaml

@@ -52,7 +52,7 @@ kind: Secret
 metadata:
   name: nifi-admin-credentials-secret
 stringData:
-  admin: {{nifiAdminPassword}}
+  admin: {{ nifiAdminPassword }}
 ---
 apiVersion: zookeeper.stackable.tech/v1alpha1
 kind: ZookeeperZnode