Adding sidecar, serviceEntry to whitelist egress

General MR

Summary

This MR introduces a Sidecar and a set of ServiceEntries for MatterMost-operator when istio.enabled: true and istio.hardened.enabled: true. This is in support of big-bang&160.

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

For issue

Upgrade Notices

A Sidecar resource has been added to the MatterMost-operator namespace that disallows egress to endpoints that are not part of the Istio service registry (a.k.a REGISTRY_ONLY). The outboundTrafficPolicy.mode in the Sidecar can be configured, however, to be something other than REGISTRY_ONLY if desired by setting istio.hardened.outboundTrafficPolicyMode. This provides a redundant layer of network security in addition to NetworkPolicies. This Sidecar is disabled by default but can be enabled by setting istio.enabled: true and istio.hardened.enabled: true.

Additionally, custom ServiceEntries can be created by populating the istio.hardened.customServiceEntries list.

added mattermostOperator priority6 statusdoing teamService Mesh labels

assigned to @charden

mentioned in merge request big-bang/bigbang!4158 (closed)

Corresponding test of the BB pipelines pass

removed statusdoing label

added statusreview label

marked this merge request as ready

requested review from @kershaw.jacob, @samvongsay, @seanthomas007, @benjamin.starks, and @cwilliams68067

approved this merge request

mentioned in commit d2386774

merged

mentioned in merge request big-bang/bigbang!4201 (merged)