Add OCI image build to Pipeline

[clementguillot]

Description

As our application is more likely to be deployed in K8s (or at least Docker/compose), we need to build OCI images.

To optimize CI build, we can just build images while in PR, and then, build and push artifact to GHCR while on main.

Since we use a "hack" to build our application by removing --link-at-build-time argument of native-image, we can't simply rely on Quarkus built-in commands like :build -Dquarkus.native.container-build=true -Dquarkus.package.type=native.
We need to do a multi-stage build by sending to context our patched native-image.args.

Refer to Dockerfile.mandrel-builder for full details.