stackgres-operator-crd-upgrade pod errors out because of bad permissions on service account token

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### Summary

stackgres-operator-crd-upgrade pod errors out because of bad permissions on service account token.

### Current Behaviour 

The pod errors out because it is unable to read the service account token with a permission denied error:

```
2022-07-06 19:04:08,336 INFO  [io.quarkus] (main) stackgres-jobs 1.2.0 native (powered by Quarkus 2.8.2.Final) started in 0.017s. Listening on: http://0.0.0.0:8080
2022-07-06 19:04:08,337 INFO  [io.quarkus] (main) Profile prod activated.
2022-07-06 19:04:08,337 INFO  [io.quarkus] (main) Installed features: [cdi, hibernate-validator, kubernetes-client, smallrye-context-propagation, vertx]



2022-07-06 19:04:08,338 WARN  [io.fa.ku.cl.Config] (main) Error reading service account token from: [/var/run/secrets/kubernetes.io/serviceaccount/token]. Ignoring.



2022-07-06 19:04:08,423 ERROR [io.qu.ru.Application] (main) Failed to start application (with profile prod): io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: GET at: https://172.20.0.1/apis/apiextensions.k8s.io/v1/customresourcedefinitions/sgbackups.stackgres.io. Message: customresourcedefinitions.apiextensions.k8s.io "sgbackups.stackgres.io" is forbidden: User "system:anonymous" cannot get resource "customresourcedefinitions" in API group "apiextensions.k8s.io" at the cluster scope. Received status: Status(apiVersion=v1, code=403, details=StatusDetails(causes=[], group=apiextensions.k8s.io, kind=customresourcedefinitions, name=sgbackups.stackgres.io, retryAfterSeconds=null, uid=null, additionalProperties={}), kind=Status, message=customresourcedefinitions.apiextensions.k8s.io "sgbackups.stackgres.io" is forbidden: User "system:anonymous" cannot get resource "customresourcedefinitions" in API group "apiextensions.k8s.io" at the cluster scope, metadata=ListMeta(_continue=null, remainingItemCount=null, resourceVersion=null, selfLink=null, additionalProperties={}), reason=Forbidden, status=Failure, additionalProperties={}).
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.requestFailure(OperationSupport.java:682)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.requestFailure(OperationSupport.java:661)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.assertResponseCode(OperationSupport.java:612)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:555)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:518)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:487)
	at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:457)
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleGet(BaseOperation.java:698)
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:184)
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:151)
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:83)
	at io.stackgres.jobs.crdupgrade.CustomResourceDefinitionFinder.findByName(CustomResourceDefinitionFinder.java:30)
	at io.stackgres.jobs.crdupgrade.CrdInstallerImpl.installCrd(CrdInstallerImpl.java:50)
	at io.stackgres.jobs.crdupgrade.CrdInstallerImpl.lambda$installCustomResourceDefinitions$0(CrdInstallerImpl.java:42)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at io.stackgres.jobs.crdupgrade.CrdInstallerImpl.installCustomResourceDefinitions(CrdInstallerImpl.java:42)
	at io.stackgres.jobs.Main.run(Main.java:61)
	at io.stackgres.jobs.Main_ClientProxy.run(Unknown Source)
	at io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:124)
	at io.quarkus.runtime.Quarkus.run(Quarkus.java:67)
	at io.quarkus.runtime.Quarkus.run(Quarkus.java:41)
	at io.quarkus.runner.GeneratedMain.main(Unknown Source)

2022-07-06 19:04:08,424 INFO  [io.st.co.ku.KubernetesClientProducer] (main) Closing instance of StackGresKubernetesClient
2022-07-06 19:04:08,426 INFO  [io.quarkus] (main) stackgres-jobs stopped in 0.003s
```



#### Steps to reproduce

Install helm chart via ArgoCD

### Expected Behaviour

This Job should be able to read the service account token

### Possible Solution

If you look at the pod definition you will see that securityContext is empty:

```
spec:
  containers:
  - env:
    - name: OPERATOR_NAME
      value: stackgres-operator
    - name: OPERATOR_NAMESPACE
      valueFrom:
        fieldRef:
          apiVersion: v1
          fieldPath: metadata.namespace
    - name: CRD_UPGRADE
      value: "true"
    - name: CONVERSION_WEBHOOKS
      value: "false"
    image: stackgres/jobs:1.2.0
    imagePullPolicy: IfNotPresent
    name: stackgres-jobs
    resources: {}
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-n8xsj
      readOnly: true
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: ip-10-100-155-169.ec2.internal
  preemptionPolicy: PreemptLowerPriority
  priority: 0
  restartPolicy: OnFailure
  schedulerName: default-scheduler



  securityContext: {}



  serviceAccount: stackgres-operator-crd-upgrade
  serviceAccountName: stackgres-operator-crd-upgrade
  terminationGracePeriodSeconds: 30
```

Adding spec.securityContext.fsGroup=65534 appears to fix this issue.

Before:

```
~ ❯ k exec -it job-test -- /bin/bash
bash-4.4$ cat /var/run/secrets/kubernetes.io/serviceaccount/token
cat: /var/run/secrets/kubernetes.io/serviceaccount/token: Permission denied
bash-4.4$ exit
```

After:

```
~ ❯ k exec -it job-test -- /bin/bash
bash-4.4$ cat /var/run/secrets/kubernetes.io/serviceaccount/token
eyJhbGciOiJSUzI1NiIs...
bash-4.4$
```


### Environment

- StackGres version: 1.2.0
<!-- if you have used helm, you can use:  `helm get notes -n stackgres stackgres-operator` 
more generic: `kubectl get deployments -n stackgres stackgres-operator --template '{{ printf "%s\n" (index .spec.template.spec.containers 0).image }}'`
-->
- Kubernetes version: v1.21.12-eks-a64ea69
<!--(use `kubectl version`) -->
- Cloud provider or hardware configuration:


### Relevant logs and/or screenshots

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logs, and code as it's very hard to read otherwise.) -->

Story points: 8.0