Release process for the extension

[stianst]

Description

Add a way to easily release an extension as an artifact downloadable from GitHub releases.

Discussion

No response

Motivation

No response

Details

No response

[thomasdarimont]

Perhaps we could leverage the work of this extension project: https://github.com/sventorben/keycloak-restrict-client-auth

They have a matrix build and github actions based release process:
https://github.com/sventorben/keycloak-restrict-client-auth/blob/main/.github/workflows

Keycloak (or some entity) could provide reusable github actions that supports a matrix build for compatibility testing.