K8sInstallerConfig controller implementation added

[mayur-tolexo]

What this PR does / why we need it:
K8sInstallerConfig controller will be generation the installation secret
for the bundleType to install on byohost

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #517

Additional information for reviewer
Normal Reconcile flow

• If the resource does not have a ByoMachine owner, exit the reconciliation
• If the Cluster to which this resource belongs cannot be found, exit the reconciliation
• If ByoMachine.status.condition. ByoHostReady reason is not equal to InstallationSecretNotAvailableReason, exit the reconciliation
• If status.ready is true, exit the reconcilaiton
• The name for the installation secret will be same as of K8sInstallerConfig
• Try to retrieve the Secret with the name from the previous step
  • If it does not exist, generate installation/uninstallation data using ByoMachine.status.hostinfo details and create the Secret with following data:
    • install (string): contains installation bash script
    • uninstall (string): contains uninstallation bash script
  • Variables: need to keep these variables in script to parse by the Byo agent.
    • {{.BundleDownloadPath}}: path on host where bundle will be downloaded by byoh agent
• Set status.installationSecret to the generated secret object reference
• Set status.ready = true
• Patch the resource to persist changes

Delete Reconcile flow

• If the resource does not have a ByoMachine owner, exit the reconciliation
• If the Cluster to which this resource belongs cannot be found, exit the reconciliation
• Fetch the secret from the status.installationSecret reference
  • If error occurred except not found then return the error
  • Else delete the secret
• Remove finalizer from K8sInstallerConfig resource
• Patch the resource to persist changes

[codecov-commenter]

Codecov Report

Merging #526 (0b2a49d) into main (ca6f3e9) will increase coverage by 1.55%.
The diff coverage is 80.26%.

❗ Current head 0b2a49d differs from pull request most recent head 0cfbfc5. Consider uploading reports for the commit 0cfbfc5 to get more accurate results

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   63.67%   65.22%   +1.55%     
==========================================
  Files          26       27       +1     
  Lines        1938     2151     +213     
==========================================
+ Hits         1234     1403     +169     
- Misses        625      657      +32     
- Partials       79       91      +12     

Impacted Files	Coverage Δ
...rs/infrastructure/k8sinstallerconfig_controller.go	78.64% <78.64%> (ø)
agent/installer/bundle_downloader.go	71.87% <100.00%> (+2.21%)	⬆️
agent/installer/installer.go	78.10% <100.00%> (ø)

[dharmjit]

@mayur-tolexo, This PR is missing tests for K8sInstallerConfigReconciler

[mayur-tolexo]

@mayur-tolexo, This PR is missing tests for K8sInstallerConfigReconciler

@dharmjit , Sorry, I didn't get it. Which test case is missing?

[dharmjit]

@mayur-tolexo, This PR is missing tests for K8sInstallerConfigReconciler

@dharmjit , Sorry, I didn't get it. Which test case is missing?

Oh my bad, somehow I missed - k8sinstallerconfig_controller_test.go

[dharmjit]

LGTM

[shubham14bajpai]

LGTM