Merge pull request #119 from jacobweinstock/hook-release-version

Use tagged version of HookOS:

## Description

<!--- Please describe what this PR is going to change -->
The latest tag changes with every push to main in the Hook repo. This has caused issue with the checksum validation.

## Why is this needed

<!--- Link to issue you have raised -->

Fixes: #

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran to -->
<!--- see how your change affects other areas of the code, etc. -->


## How are existing users impacted? What migration steps/scripts do we need?

<!--- Fixes a bug, unblocks installation, removes a component of the stack etc -->
<!--- Requires a DB migration script, etc. -->


## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

tinkerbell/stack/values.yaml

@@ -26,7 +26,7 @@ stack:
     downloadsDest: /opt/hook
     # downloadURL only works with the > 0.8.1 Hook release because
     # previous Hook versions didn't provide a checksum file.
-    downloadURL: https://github.com/tinkerbell/hook/releases/download/latest
+    downloadURL: https://github.com/tinkerbell/hook/releases/download/v0.9.0
   kubevip:
     enabled: true
     name: kube-vip