Makefile

[dewjam]

1. Issue, if available:
When releasing a new version of Karpenter, it's possible to leave CLOUD_PROVIDER environment variable unset. If CLOUD_PROVIDER is not set, the resultant artifact defaults to the fake/test cloud provider.

If you run make release more than once, the 'preview' website content is copied inside of the 'versioned' website content when it should not be.

2. Description of changes:
This changes requires the CLOUD_PROVIDER environment variable to be set when running make release. Additionally, it makes the website content copy step idempotent.

3. How was this change tested?
Ran make release multiple times with the CLOUD_PROVIDER env set and unset. When unset or set to an empty string, the release fails.

GOFLAGS="-tags= -ldflags=-X=github.com/aws/karpenter/pkg/utils/project.Version=v0.7.3-13-g5495dd3" ./hack/release.sh
CLOUD_PROVIDER environment variable is not set: 'export CLOUD_PROVIDER=aws'
make: *** [release] Error 1

When the CLOUD_PROVIDER env is set and make release is executed multiple times, the 'preview' content is not copied inside of the versioned content folder.

drwxr-xr-x  7 user group 4.0K Mar 29 14:58 .
drwxr-xr-x 20 user group 4.0K Mar 29 14:57 ..
drwxr-xr-x  2 user group 4.0K Mar 29 14:58 AWS
drwxr-xr-x  2 user group 4.0K Mar 29 14:58 concepts
-rw-r--r--  1 user group 4.2K Mar 29 14:58 development-guide.md
-rw-r--r--  1 user group  12K Mar 29 14:58 faq.md
drwxr-xr-x  5 user group 4.0K Mar 29 14:58 getting-started
-rwxr-xr-x  1 user group 1.6K Mar 29 14:58 _index.md
-rw-r--r--  1 user group  7.7K Mar 29 14:58 provisioner.md
drwxr-xr-x  2 user group  4.0K Mar 29 14:58 tasks
-rw-r--r--  1 user group  4.8K Mar 29 14:58 troubleshooting.md
drwxr-xr-x  2 user group  4.0K Mar 29 14:58 upgrade-guide

4. Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: link to issue
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[bwagner5]

lgtm