Tweaks buildx settings to cache images properly

[nicomiguelino]

Description

• This could reduce build times.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[nicomiguelino]

This is already implemented in master and is implemented in Python:

Anthias/tools/image_builder/__main__.py

Lines 135 to 138 in ec67066

	cache_to={
	'type': 'local',
	'dest': str(cache_dir),
	'mode': 'max',

However, the current change doesn't reduce the build time.