Merge #2504

2504: Remove superfluous cache export entry for arm r=mergify[bot] a=Diman0

## What type of PR?

fix

## What does this PR do?
Fix arm build. The arm job contained one cache export entry too many. Only one cache export entry is allowed.

### Related issue(s)


## 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

@@ -253,7 +253,6 @@ jobs:
             *.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
             *.cache-from=type=registry,ref=ghcr.io/${{ steps.string.outputs.lowercase }}/base:${{ hashFiles('core/base/Dockerfile','core/base/requirements-prod.txt') }}-arm
-            *.cache-to=type=registry,ref=ghcr.io/${{ steps.string.outputs.lowercase }}/base:${{ hashFiles('core/base/Dockerfile','core/base/requirements-prod.txt') }}-arm,mode=max
             *.platform=${{ inputs.architecture }}
 
 # This job runs all the tests.