Backport of Add NET_BIND_SERVICE to the security context in the deployment of Mesh Gateway (NET-6463) into release/1.2.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #3549 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@missylbytes
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "807c119dc615aed148295111f0f4dce1ef8f6783", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

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Adds the NET_BIND_SERVICE to the security context in the deployment of the Mesh Gateway for the Consul Dataplane container.

This is related to this PR hashicorp/consul-dataplane#238 in the Consul Dataplane
NET-6463

How I've tested this PR

• Manual testing to see the security context is added to the Consul Dataplane container

kubectl get deployment -n consul consul-consul-mesh-gateway -o yaml
# Below has been edited for brevity
apiVersion: apps/v1
kind: Deployment
metadata:
  name: consul-consul-mesh-gateway
  namespace: consul
spec:
  template:
    spec:
      containers:
        - args:
            - -addresses=consul-consul-server.consul.svc
            - -grpc-port=8502
            - -proxy-service-id-path=/consul/service/proxy-id
            - -ca-certs=/consul/tls/ca/tls.crt
            - -credential-type=login
            - -login-bearer-token-path=/var/run/secrets/kubernetes.io/serviceaccount/token
            - -login-auth-method=consul-consul-k8s-component-auth-method
            - -login-partition=default
            - -service-partition=default
            - -log-level=info
            - -log-json=false
          command:
            - consul-dataplane
          image: docker.io/hashicorppreview/consul-dataplane:1.2.5-ubi
          imagePullPolicy: IfNotPresent
          securityContext:
            capabilities:
              add:
                - NET_BIND_SERVICE
              drop:
                - ALL

How I expect others to test this PR

You cant test this without openshift, just install the branch with MeshGateways enabled and check to see if there is a security context.

Someone else was kind enough to test on Openshift:

Checklist

• Tests added

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Overview of commits

• 47839c2 - 2264c14 - 807c119 - 9320f78 - 89c0a1e - b37685c - a7d3817 - e4f08c9