Terraform release

[aledbf]

What this PR does / why we need it:

Adds a new script to build the ingress controller image using Terraform in AWS with a Spot instance.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

[aledbf]

/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [aledbf]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov-io]

Codecov Report

Merging #4613 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4613      +/-   ##
==========================================
+ Coverage   58.67%   58.73%   +0.05%     
==========================================
  Files          88       88              
  Lines        6764     6752      -12     
==========================================
- Hits         3969     3966       -3     
+ Misses       2356     2352       -4     
+ Partials      439      434       -5

Impacted Files	Coverage Δ
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️
cmd/nginx/main.go	6.53% <0%> (+0.04%)	⬆️
internal/ingress/controller/controller.go	50.61% <0%> (+0.06%)	⬆️
internal/ingress/metric/collectors/process.go	90.42% <0%> (+2.12%)	⬆️
cmd/nginx/flags.go	89.41% <0%> (+2.74%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2de5a89...56c4a69. Read the comment docs.

[aledbf]

This is ready. Release 0.26.1 was generated with the content of this PR.