[v0.12.x] Flatcar

[jorge07]

In this PR:

• Replace Flatcar for 0.12.x branch
• Created ReleaseChannel model to keep logic outside config
• Introduces a cmd to get latests AmiID for the cluster.yaml configuration. Example:

➜ kube-aws ami
The Flatcar AmiId for region us-east-1 and release channel stable is different than the one in cluster definition.

Cluster.yaml:
- amiId: ami-04e51eabc8abea762
+ amiId: ami-011655f166912d5ba

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign redbaron
You can assign the PR to them by writing /assign @redbaron in a comment when ready.

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

Needs approval from an approver in each of these files:

• OWNERS

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

[dominicgunn]

Hey @jorge07,

Is your team still actively using v0.12.x? I'm hesistant to merge & create a release unless you are.

[jorge07]

Yes we do. We've some clusters in 0.12.x where the upgrade to 0.13.x didn't end well, so we maintain 0.12.x branch.

[codecov-commenter]

Codecov Report

Merging #1856 into v0.12.x will decrease coverage by 0.09%.
The diff coverage is 5.88%.

@@             Coverage Diff             @@
##           v0.12.x    #1856      +/-   ##
===========================================
- Coverage    38.19%   38.09%   -0.10%     
===========================================
  Files           75       76       +1     
  Lines         4658     4667       +9     
===========================================
- Hits          1779     1778       -1     
- Misses        2633     2643      +10     
  Partials       246      246              

Impacted Files	Coverage Δ
core/nodepool/config/config.go	34.49% <ø> (ø)
flatcar/amiregistry/amiregistry.go	0.00% <0.00%> (ø)
flatcar/amiregistry/reliable_http.go	86.36% <ø> (ø)
model/release_channel.go	0.00% <0.00%> (ø)
core/controlplane/config/config.go	63.24% <100.00%> (-0.05%)	⬇️

---

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 0ea4367...a5d83c3. Read the comment docs.

[dominicgunn]

Got it, thanks for the PR.

[dominicgunn]

/lgtm