use set function instead of merge

merge does a deep merge, but that could cause weird problems
if two different livenessProbe definitions were merged and
other things that would not make sense.

Instead, we use set to mutate the $sensor dictionary applying
the override values on top of the defaults, effectively merging
only one level of the dictionaries.

Author: cognifloyd

templates/deployments.yaml

@@ -982,7 +982,10 @@ spec:
     {{- end }}
 
 {{- range .Values.st2.packs.sensors }}
-  {{- $sensor := deepCopy $.Values.st2sensorcontainer | mustMergeOverwrite . }}
+  {{- $sensor := omit $.Values.st2sensorcontainer "name" "ref" "postStartScript" }}
+  {{- range $key, $val := . }}
+    {{- $_ := set $sensor $key $val }}
+  {{- end }}
   {{- $name := print "st2sensorcontainer" (include "hyphenPrefix" $sensor.name) }}
 ---
 apiVersion: apps/v1