Emissary-Ingress - v2.1.2

:tada: Emissary Ingress 2.1.2 :tada:

Emissary Ingress is an open source, Kubernetes-native microservices API gateway built on the Envoy Proxy.

Upgrade Emissary - https://www.getambassador.io/reference/upgrading.html
View changelog - https://github.com/emissary-ingress/emissary/blob/v2.1.2/CHANGELOG.md
Get started with Emissary on Kubernetes - https://www.getambassador.io/user-guide/getting-started

• Bugfix: Emissary-ingress 2.1.0 generated invalid Envoy configuration for getambassador.io/v2
Mappings that set spec.cors.origins to a string rather than a list of strings; this has been
  fixed, and these Mappings should once again function correctly.

• Bugfix: Changes to the weight of Mapping in a canary group will now always be correctly
  managed during reconfiguration; such changes could have been missed in earlier releases.

• Bugfix: A Mapping that is not part of a canary group, but that has a weight less than 100,
  will be correctly configured to receive all traffic as if the weight were 100.

• Bugfix: Using rewrite: "" in a Mapping is correctly handled to mean "do not rewrite the path
  at all".

• Bugfix: Mappings with DNS wildcard hostname will now be correctly matched with Hosts.
  Previously, the case where both the Host and the Mapping use DNS wildcards for their hostnames
  could sometimes not correctly match when they should have.

• Bugfix: Any Mapping that uses the host_redirect field is now properly discovered and used.
  Thanks to Gabriel Féron for contributing this bugfix! (3709)

• Bugfix: If the ambassador Module sets a global default for add_request_headers,
  add_response_headers, remove_request_headers, or remove_response_headers, it is often
  desirable to be able to turn off that setting locally for a specific Mapping. For several
  releases this has not been possible for Mappings that are native Kubernetes resources (as
  opposed to annotations), as an empty value ("mask the global default") was erroneously considered
  to be equivalent to unset ("inherit the global default"). This is now fixed.

• Bugfix: It is now possible to set a Mapping spec.error_response_overrides body.text_format
  to an empty string or body.json_format to an empty dict. Previously, this was possible for
  annotations but not for native Kubernetes resources.

• Bugfix: Resources that exist as getambassador.io/config annotations rather than as native
  Kubernetes resources are now validated and internally converted to v3alpha1 and, the same as
  native Kubernetes resources.

• Bugfix: Resource validation errors are now reported more consistently; it was the case that in
  some situations a validation error would not be reported.

• Change: Docker BuildKit is enabled for all Emissary builds. Additionally, the Go build cache is
  fully enabled when building images, speeding up repeated builds.