docker improvements (#2455)

.dockerignore

@@ -1 +1,2 @@
-build
+*
+!firmware/tools/docker-entrypoint.sh

dockerize.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+#################################################
+# This script aids building mayhem inside docker
+#
+# Basic usage:
+# - Build dev container: ./dockerize.sh build
+# - Build mayhem: ./dockerize.sh
+#
+# The image will be automatically build if it
+# does not exist, but if the dockerfile changes
+# it need to be rebuilt manually.
+# 
+# Advanced parameters:
+# - Get a shell inside the build image to
+#   inspect problems: ./dockerize.sh shell
+# - Give additional parameters to the container:
+#   ./dockerize.sh -j10
+#   ./dockerize.sh ninja -j10
+# - Use a different dockerfile:
+#   ./dockerize.sh build dockerfile-other
+# - Use a different cpu architecture:
+#   ./dockerize.sh build dockerfile-nogit-arm arm64
+#
+# Environment variables:
+# - It is possible to override the default image
+#   name that is being used to build and run the
+#   build container using an environment variable.
+#   The default is 'portapack-dev'
+#   Override by setting the following environment
+#   variable: MAYHEM_DEV_DOCKER_IMAGE
+#
+
+#
+# Copyright (C) 2024 u-foka
+#
+# This file is part of PortaPack.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+set -e # exit immediatelly on any failure
+
+DIR="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
+IMAGE="${MAYHEM_DEV_DOCKER_IMAGE:-portapack-dev}"
+
+build_image() {
+   DOCKERFILE=${1:-dockerfile-nogit}
+   PLATFORM=${2:-amd64}
+   docker build --platform "linux/${PLATFORM}" -t "${IMAGE}" -f "${DOCKERFILE}" .
+}
+
+start_docker() {
+   if [ -z "$(docker images -q ${IMAGE} 2> /dev/null)" ]; then
+      build_image
+   fi
+
+   exec docker run -v "${DIR}:/havoc" -u "$(id -u):$(id -g)" -ti --rm "${IMAGE}" "$@"
+}
+
+if [ "$1" = 'shell' ]; then # open a shell into the container
+   start_docker "bash -li"
+elif [ "$1" = 'build' ]; then # build the default (or specified) target with ninja
+   shift # remove the first item from $@ as we consumed it, we can then pass the rest on to make
+   build_image "$@"
+   exit $?
+fi
+
+start_docker "$@"

firmware/tools/docker-entrypoint.sh

@@ -1,5 +1,26 @@
 #!/bin/bash
 
+#
+# Copyright (C) 2024 u-foka
+#
+# This file is part of PortaPack.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
 set -e # exit immediatelly on any failure
 
 build_make() {