Add multiarch container builds

[arbourd]

Description

Uses docker manifests to build 2 separate images, one per arch, pushes them both, and then combines them with common tags, as per the docs: https://goreleaser.com/customization/docker_manifest/

Fixes #440

Type of change

• CI/Build

Version of Golang used when building/testing:

• 1.18

How Has This Been Tested?

Ran locally and built the images with GoReleaser.

  • docker images
    • building docker image                          image=vektra/mockery:v2.14.1-arm64
    • building docker image                          image=vektra/mockery:v2.14.1-amd64
    • took: 15s

The manifests command doesn't run unless the release actually happens.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Base: 72.42% // Head: 72.42% // No change to project coverage 👍

Coverage data is based on head (e9abbc5) compared to base (94c17ff).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #518   +/-   ##
=======================================
  Coverage   72.42%   72.42%           
=======================================
  Files           6        6           
  Lines        1262     1262           
=======================================
  Hits          914      914           
  Misses        304      304           
  Partials       44       44           

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