Add new swh-toolbox application

This is a deployment toolbox. For starters, it will ease the registering of new
scheduler task type.

Refs. sysadm-environment#5030

apps/swh-toolbox/Dockerfile

+# Deeply inspired from the Dockerfile of the swh-graph project
+FROM python:3.10-bullseye
+
+RUN apt-get -y update && \
+    apt-get -y upgrade && \
+    apt-get install -y libcmph-dev librdkafka-dev libsystemd-dev \
+      opam git r-base-dev \
+      sed && \
+    apt clean && \
+    addgroup --gid 1000 swh && \
+    useradd --gid 1000 --uid 1000 -m -d /opt/swh swh && \
+    mkdir /etc/swh
+
+USER swh
+WORKDIR /opt/swh
+
+COPY --chown=swh:swh requirements-frozen.txt /opt/swh
+COPY --chown=swh:swh entrypoint.sh /opt/swh
+
+ENV PYTHONPATH=/opt/swh
+ENV PATH=/opt/swh/.local/bin:$PATH
+
+RUN chmod u+x /opt/swh/entrypoint.sh && \
+    /usr/local/bin/python -m pip install --upgrade pip && \
+    pip install --no-cache-dir -r requirements-frozen.txt && \
+    pip install gunicorn
+
+ENV SWH_CONFIG_FILENAME=/etc/swh/config.yml
+
+ENTRYPOINT "/opt/swh/entrypoint.sh"

apps/swh-toolbox/entrypoint.sh

+#!/bin/bash
+
+set -e
+
+case "$1" in
+  "shell")
+      shift
+      echo "Running command $@"
+      exec bash -i "$@"
+    ;;
+  *)
+      echo "Registering new swh scheduler tasks"
+      exec python -m swh scheduler \
+           --config-file ${SWH_CONFIG_FILENAME} \
+           task-type register
+    ;;
+esac

apps/swh-toolbox/requirements.txt

+swh.scheduler
+swh.lister
+swh.loader.core