zephyr-lite: add dockerfile for lightweight zephyr docker

zephyr-lite is a new docker image based on zephyr-build to fit within
storage limit of current free tier runners.

Signed-off-by: Mateusz Redzynia <mateuszx.redzynia@intel.com>

Author: redzynix

scripts/docker_build/zephyr_lite/Dockerfile

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+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2025 Intel Corporation. All rights reserved.
+
+# Use zephyr-build as base image
+FROM ghcr.io/zephyrproject-rtos/zephyr-build:v0.27.4 as base
+
+# Remove additional toolchains.
+# As this is not ideal solution there is a plan to build docker image without zephyr-build as the base
+# and install only needeed toolchains in the future.
+RUN cd /opt/toolchains/zephyr-sdk-0.17.0 && \
+    sudo rm -rvf arc* \
+        micro* \
+        mips* \
+        nios* \
+        risc* \
+        sparc* \
+        x86* \
+        xtensa-espressif* \
+        xtensa-sample* \
+        xtensa-dc233c*
+
+# Some of tests require python 3.12 - instll it from source
+RUN cd /tmp && wget -q --show-progress --progress=bar:force:noscroll --no-check-certificate https://www.python.org/ftp/python/3.12.9/Python-3.12.9.tgz && \
+    tar -xf Python-3.12.9.tgz && \
+    cd Python-3.12.9 && \
+    ./configure && \
+    sudo make -j$(nproc) && \
+    sudo make install && \
+    sudo rm -rf /tmp/Python-3*
+
+# Reinstall python3.10 packages with python3.12
+RUN python3.10 -m pip freeze > /tmp/python3.10.pip.txt && \
+    cat /tmp/python3.10.pip.txt | xargs -n 1 python3.12 -m pip install || true
+
+# Use ubuntu24.04 as base for zephyr-lite
+FROM ubuntu:24.04 as zephyr-lite
+
+# Copy needed files from base to zephyr-lite
+# /opt for toolchains and sdk
+# /usr for binaries and libs
+# /home for libs installed in .local
+COPY --from=base /opt /opt
+COPY --from=base /usr /usr
+COPY --from=base /home /home
+
+USER root
+
+# Create a user if it doesn't already exist and grant them permission to /home/user.
+# Add user to dialout and sudo group
+RUN useradd -ms /bin/bash user && \
+    chown -R user:user /home/user && \
+    usermod -a -G dialout,sudo user
+
+USER user
+
+# Set zephyr env variables
+ENV ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-0.17.0
+ENV ZEPHYR_TOOLCHAIN_VARIANT=zephyr