Update to v0.9.0: (#236)

## Description

<!--- Please describe what this PR is going to change -->
Preparation for the v0.9.0 release.

## 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

Author: jacobweinstock

.github/workflows/build-all-matrix.yaml

@@ -19,7 +19,7 @@ env: # Global environment, passed to all jobs & all steps
   # To do so, set the secret DOCKERHUB_USERNAME and DOCKERHUB_PASSWORD in the repo secrets, and set the below to yes.
   LOGIN_TO_DOCKERHUB: "yes"
 
-  HOOK_VERSION: "0.9.0-alpha1-build-${{github.run_number}}" # Use a forced Hook version
+  HOOK_VERSION: "0.9.0-build-${{github.run_number}}" # Use a forced Hook version
 
   # Which flavors to build? space separated list, must match one of the TAG='s in flavors (this is used by matrix_prep job in gha-matrix command)
   CI_TAGS: "standard armbian-sbc armbian-uefi lts" # 'dev' is not included

README.md

@@ -64,7 +64,7 @@ It will then speak with the `hook-docker` engine API through the shared `/var/ru
 
 ### Introduction / recently changed
 
-> This refers to the 0.9.0-alpha version, compared to 0.8.1.
+> This refers to the 0.9.0 version, compared to 0.8.1.
 
 - Replaces the emulated Alpine kernel build with a Debian based cross-compiling build
   - Much faster building. Emulating x86_64 on arm64 is very slow and vice-versa.

build.sh

@@ -43,7 +43,7 @@ else # otherwise default to tty, but allow override
 fi
 
 # Set the default HOOK_VERSION; override with env var; -x exports it for envsubst later
-declare -g -r -x HOOK_VERSION="${HOOK_VERSION:-"0.9.0-alpha1"}"
+declare -g -r -x HOOK_VERSION="${HOOK_VERSION:-"0.9.0"}"
 log info "Using Hook version (HOOK_VERSION): ${HOOK_VERSION}"
 
 ### Inventory