feat: Collect license used to install cluster in support bundles

[banjoh]

What this PR does / why we need it:

• Store license file used to install cluster in <data-dir>
• Add host collector spec to collect the license in support bundle

Demo: https://asciinema.org/a/uhpIRKKc5C9k7MtP1ovI69Kte

I missed showing the file permissions of license.yaml in the demo

[evans] $ make ssh-node0
root@node0:/replicatedhq/embedded-cluster# ls -al /root/ec-data-dir/license.yaml
-r-------- 1 root root 5514 Dec 23 16:24 /root/ec-data-dir/license.yaml
root@node0:/replicatedhq/embedded-cluster#

Which issue(s) this PR fixes:

sc-116758

Does this PR require a test?

NONE

Does this PR require a release note?

Store installer license file in data-dir and add collect when generating a support bundle

Does this PR require documentation?

NONE

[github-actions]

This PR has been released (on staging) and is available for download with a embedded-cluster-smoke-test-staging-app license ID.

Online Installer:

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci/appver-dev-2054de7" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Airgap Installer (may take a few minutes before the airgap bundle is built):

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci-airgap/appver-dev-2054de7?airgap=true" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Happy debugging!

[JGAntunes]

Change LGTM overall, wondering what you think about adding a test for this changes?

My suggestion would be to piggy back on the dryrun tests we have for the install command (which should be relatively quick to do) here:

• embedded-cluster/tests/dryrun/install_test.go

  Lines 19 to 40 in 2c21588

  	func TestDefaultInstallation(t *testing.T) {
  	dr := dryrunInstall(t)
  	// --- validate os env --- //
  	assertEnv(t, dr.OSEnv, map[string]string{
  	"TMPDIR": "/var/lib/embedded-cluster/tmp",
  	"KUBECONFIG": "/var/lib/embedded-cluster/k0s/pki/admin.conf",
  	})
  	// --- validate commands --- //
  	assertCommands(t, dr.Commands,
  	[]interface{}{
  	regexp.MustCompile(`k0s install controller .* --data-dir /var/lib/embedded-cluster/k0s`),
  	},
  	false,
  	)
  	// --- validate host preflight spec --- //
  	assertCollectors(t, dr.HostPreflightSpec.Collectors, map[string]struct {
  	match func(*troubleshootv1beta2.HostCollect) bool
  	validate func(*troubleshootv1beta2.HostCollect)
  	}{

[laverya]

well, that solution.... did not work
(two reasons: one is that the new location for the check also encountered the 'previous-stable' tests, which don't have this code yet, and another is that it also ran after restores which don't have the file either)

[jtuchscherer]

Went through the change with Andrew in person. Passing the short sha variable is not great, but it's a good solution for now