Merge #2508

2508: Actually push the build arm images to ghcr.io r=mergify[bot] a=Diman0

## What type of PR?

fix

## What does this PR do?
Makes sure the images build for arm are actually pushed to ghcr.io.

### Related issue(s)
n/a

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [n/a] In case of feature or enhancement: documentation updated accordingly
- [n/a] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Dimitri Huisman <diman@huisman.xyz>

.github/workflows/build_test_deploy.yml

@@ -300,7 +300,7 @@ jobs:
           files: ${{env.HCL_FILE}}
           targets: ${{ matrix.target }}
           load: false
-          push: false
+          push: true
           set: |
             *.cache-from=type=registry,ref=ghcr.io/${{ steps.string.outputs.lowercase }}/${{ matrix.target }}:buildcache-arm
             *.cache-to=type=registry,ref=ghcr.io/${{ steps.string.outputs.lowercase }}/${{ matrix.target }}:buildcache-arm,mode=max