BUG: customSplit does not properly handle "--- "

[gianlucam76]

Problem Description

Creating a Secret with this content and then asking Sveltos to deploy it, does not fully work.
Because of extra white spaces after ---, the ServiceAccount is not deployed.

---                
apiVersion: v1
kind: ServiceAccount

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: network-attachment-definitions.k8s.cni.cncf.io
spec:
  group: k8s.cni.cncf.io
  scope: Namespaced
  names:
    plural: network-attachment-definitions
    singular: network-attachment-definition
    kind: NetworkAttachmentDefinition
    shortNames:
    - net-attach-def
  versions:
  - name: v1
    served: true
    storage: true
    schema:
      openAPIV3Schema:
        description: 'NetworkAttachmentDefinition is a CRD schema specified by the Network Plumbing Working Group to express the intent for attaching pods to one or more logical or physical networks. More information available at: https://github.com/k8snetworkplumbingwg/multi-net-spec'
        type: object
        properties:
          apiVersion:
            description: 'APIVersion defines the versioned schema of this represen tation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
            type: string
          kind:
            description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
            type: string
          metadata:
            type: object
          spec:
            description: 'NetworkAttachmentDefinition spec defines the desired state of a network attachment'
            type: object
            properties:
              config:
                description: 'NetworkAttachmentDefinition config is a JSON-formatted CNI configuration'
                type: string
---                
apiVersion: v1
kind: ServiceAccount
metadata:
  name: multus
  namespace: kube-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: multus
rules:
- apiGroups: ["k8s.cni.cncf.io"]
  resources:
  - '*'
  verbs:
  - '*'
- apiGroups:
  - ""
  resources:
  - pods
  - pods/status
  verbs:
  - get
  - update
- apiGroups:
  - ""
  - events.k8s.io
  resources:
  - events
  verbs:
  - create
  - patch
  - update
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: multus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: multus
subjects:
- kind: ServiceAccount
  name: multus
  namespace: kube-system
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-multus-ds
  namespace: kube-system
  labels:
    tier: node
    app: multus
    name: multus
spec:
  selector:
    matchLabels:
      name: multus
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        tier: node
        app: multus
        name: multus
    spec:
      hostNetwork: true
      hostPID: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      - operator: Exists
        effect: NoExecute
      serviceAccountName: multus
      containers:
      - name: kube-multus
        image: ghcr.io/k8snetworkplumbingwg/multus-cni:v4.0.2-thick
        command: ["/usr/src/multus-cni/bin/multus-daemon"]
        resources:
          requests:
            cpu: "100m"
            memory: "200Mi"
          limits:
            cpu: "100m"
            memory: "200Mi"
        securityContext:
          privileged: true
        volumeMounts:
        - name: cni
          mountPath: /host/etc/cni/net.d
        - name: host-run
          mountPath: /host/run
        - name: host-var-lib-cni-multus
          mountPath: /var/lib/cni/multus
        - name: host-var-lib-kubelet
          mountPath: /var/lib/kubelet
        - name: host-run-k8s-cni-cncf-io
          mountPath: /run/k8s.cni.cncf.io
        - name: host-run-netns
          mountPath: /run/netns
          mountPropagation: HostToContainer
        - name: multus-daemon-config
          mountPath: /etc/cni/net.d/multus.d
          readOnly: true
        - name: hostroot
          mountPath: /hostroot
          mountPropagation: HostToContainer
      initContainers:
      - name: install-multus-binary
        image: ghcr.io/k8snetworkplumbingwg/multus-cni:v4.0.2-thick
        command:
        - "cp"
        - "/usr/src/multus-cni/bin/multus-shim"
        - "/host/opt/cni/bin/multus-shim"
        resources:
          requests:
            cpu: "10m"
            memory: "15Mi"
        securityContext:
          privileged: true
        volumeMounts:
        - name: cnibin
          mountPath: /host/opt/cni/bin
          mountPropagation: Bidirectional
      terminationGracePeriodSeconds: 10
      volumes:
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: cnibin
        hostPath:
          path: /opt/cni/bin
      - name: hostroot
        hostPath:
          path: /
      - name: multus-daemon-config
        configMap:
          name: multus-daemon-config
          items:
          - key: daemon-config.json
            path: daemon-config.json
      - name: host-run
        hostPath:
          path: /run
      - name: host-var-lib-cni-multus
        hostPath:
          path: /var/lib/cni/multus
      - name: host-var-lib-kubelet
        hostPath:
          path: /var/lib/kubelet
      - name: host-run-k8s-cni-cncf-io
        hostPath:
          path: /run/k8s.cni.cncf.io
      - name: host-run-netns
        hostPath:
          path: /run/netns/