fix(plugin): Fixes arm64 compatibility to plugin docker image. Fixes #1728

[cguertin14]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

What's accomplished

The quay.io/argoproj/kubectl-argo-rollouts can now run on arm64 :D.
Closes #1728, which contains all the important details about this.

Demo of the new fix

Wrote a quick demo using the new docker image which I pushed to my own Quay account for testing. We can see in the screenshot that the new Docker image runs smoothly on arm64 and the old one does not.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #1732 (028bd3e) into master (a3477cf) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1732      +/-   ##
==========================================
+ Coverage   82.02%   82.04%   +0.01%     
==========================================
  Files         116      116              
  Lines       16096    16096              
==========================================
+ Hits        13203    13206       +3     
+ Misses       2218     2216       -2     
+ Partials      675      674       -1     

Impacted Files	Coverage Δ
rollout/trafficrouting/istio/controller.go	52.43% <0.00%> (+1.62%)	⬆️

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[jessesuen]

Great work!