Draft: build debian package

It would be nice to add this debian package to the CI.

For the moment, it is published manually → https://forum.duniter.org/t/paquet-debian-pour-gcli/12272

docker/build.sh

-#!/bin/bash
+#!/bin/sh
 
-# Also generated by chatGPT
-
-# Name of your Docker image
-IMAGE_NAME="gcli"
-
-# Version of your Docker image
-IMAGE_VERSION="latest"
-
-# Build and tag the Docker image using Docker Buildx
-docker buildx build -t "$IMAGE_NAME:$IMAGE_VERSION" .
-
-# Optionally, you can push the image to a Docker registry
-# docker push "$IMAGE_NAME:$IMAGE_VERSION"
+IMAGE_NAME=gcli
+IMAGE_VERSION=latest
+docker buildx build -t $IMAGE_NAME:$IMAGE_VERSION .