Helm chart and post install job hook during helm upgrade - kubernetes-helm

Question

I have a job st as post-install in my helm charts which is looks like
apiVersion: batch/v1
kind: Job
metadata:
name: job-hook-postinstall
annotations:
"helm.sh/hook": "post-install"
spec:
template:
spec:
containers:
- name: post-install
image: {{ .Values.image.initContainer.curl }}
imagePullPolicy: IfNotPresent
command:
- '/bin/sh'
- '-c'
- >
PAYLOAD='{"password":"password"}';
curl -X PUT "http://server:{{ .Values.app.Server.service.port }}/users/userA" -H "Authorization: Basic {{ .Values.app.livenessProbe.Server.authorization }}" -H 'Content-Type: application/json' --data-raw $PAYLOAD &&
curl -X PUT "http://server:{{ .Values.app.Server.service.port }}/users/userB" -H "Authorization: Basic {{ .Values.app.livenessProbe.Server.authorization }}" -H 'Content-Type: application/json' --data-raw $PAYLOAD
restartPolicy: OnFailure
terminationGracePeriodSeconds: 0
backoffLimit: 20
completions: 1
which I expect will be executed only during helm install but is getting executed during helm upgrade as well.
Other problem is that it will error out on Error: failed post-install: job failed: BackoffLimitExceeded when I have bumped it to 20
Any thoughts on both problems? Can I do some kind of a loop to check if the connection to the server endpoint is present then execute curls to prevent at least second problem? Will below work?
...
command:
- '/bin/sh'
- '-c'
- >
for i in $(seq 1 300); do nc -zvw1 server {{ .Values.app.Server.service.port }} && exit 0 || sleep 3;
done;
PAYLOAD='{"password":"password"}';'
....
or to execute that job after specific pod deployment?