Container: Add initial container for meshtastic-cli

Just a quick set of files to enable the build of (tagged) containers.
Both alpine and debian containers are available (~200MiB/~1.2GiB)
allowing us to use meshtastic cli with a quick docker run, instead of
having to build/install stuff locally.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

Containerfile.debian

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# Copyright (C) 2025 Olliver Schinagl <oliver@schinagl.nl>
+
+ARG TARGET_VERSION="3.11"
+ARG TARGET_ARCH="library"
+
+FROM docker.io/${TARGET_ARCH}/python:${TARGET_VERSION}
+
+WORKDIR /usr/local/app
+
+COPY . /usr/local/app
+
+RUN _poetry_venv_dir="$(mktemp -d -p "${TMPDIR:-/tmp}" 'poetry_venv.XXXXXX')" && \
+    python -m 'venv' "${_poetry_venv_dir}" && \
+    "${_poetry_venv_dir}/bin/pip" install 'poetry' && \
+    "${_poetry_venv_dir}/bin/poetry" config --local virtualenvs.create false && \
+    "${_poetry_venv_dir}/bin/poetry" install --no-directory && \
+    rm -f -r "${_poetry_venv_dir}" && \
+    rm -f -r "/usr/local/app"
+
+COPY "./bin/container-entrypoint.sh" "/init"
+
+ENTRYPOINT [ "/init" ]