Add first Docker image recipe

This image can be used in CI or as a development container.

.github/docker/README.md

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+# Content
+
+Dockerfiles and scripts placed in this directory are intended to be used as
+development process vehicles and part of continuous integration process.
+
+Images built out of those recipes may by used with Docker or podman as
+development environment.
+
+# How to build docker image
+
+To build docker image on local machine execute:
+
+```sh
+docker build -t ur:ubuntu-22.04 -f ./ubuntu-22.04.Dockerfile .
+```
+
+To set any build time variable (e.g., an optional ARG from docker recipe), add to the command (after `build`), e.g.:
+
+```sh
+ --build-arg SKIP_DPCPP_BUILD=1
+```
+
+One other example of using these extra build arguments are proxy settings. They are required for accessing network
+(e.g., to download dependencies within docker), if a host is using a proxy server. Example usage:
+
+```sh
+ --build-arg https_proxy=http://proxy.com:port --build-arg http_proxy=http://proxy.com:port 
+```
+
+# How to use docker image
+
+To run docker container (using the previously built image) execute:
+
+```sh
+docker run --shm-size=4G -v /your/workspace/path/:/opt/workspace:z -w /opt/workspace/ -it ur:ubuntu-22.04 /bin/bash
+```
+
+To set (or override) any docker environment variable, add to the command (after `run`):
+
+```sh
+ -e ENV_VARIABLE=VALUE
+```

.github/docker/install_dpcpp.sh

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+#!/usr/bin/env bash
+# Copyright (C) 2023 Intel Corporation
+# Part of the Unified-Runtime Project, under the Apache License v2.0 with LLVM Exceptions.
+# See LICENSE.TXT
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#
+# install_dpcpp.sh - unpacks DPC++ in ${DPCPP_PATH}, to be used while building UR
+#
+
+set -e
+
+if [ "${SKIP_DPCPP_BUILD}" ]; then
+	echo "Variable 'SKIP_DPCPP_BUILD' is set; skipping building DPC++"
+	exit
+fi
+
+apt-get install -y --no-install-recommends \
+	libncurses5
+
+mkdir -p ${DPCPP_PATH}
+wget -O ${DPCPP_PATH}/dpcpp_compiler.tar.gz https://github.com/intel/llvm/releases/download/sycl-nightly%2F20230626/dpcpp-compiler.tar.gz
+tar -xvf ${DPCPP_PATH}/dpcpp_compiler.tar.gz -C ${DPCPP_PATH}/

.github/docker/install_libbacktrace.sh

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+#!/usr/bin/env bash
+# Copyright (C) 2023 Intel Corporation
+# Part of the Unified-Runtime Project, under the Apache License v2.0 with LLVM Exceptions.
+# See LICENSE.TXT
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#
+# install_libbacktrace.sh - builds and installs tracing library
+#
+
+set -e
+
+if [ "${SKIP_LIBBACKTRACE_BUILD}" ]; then
+	echo "Variable 'SKIP_LIBBACKTRACE_BUILD' is set; skipping building libbacktrace"
+	exit
+fi
+
+git clone https://github.com/ianlancetaylor/libbacktrace.git
+pushd libbacktrace
+./configure
+make -j$(nproc)
+make install -j$(nproc)
+popd

.github/docker/ubuntu-22.04.Dockerfile

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+# Copyright (C) 2023 Intel Corporation
+# Part of the Unified-Runtime Project, under the Apache License v2.0 with LLVM Exceptions.
+# See LICENSE.TXT
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#
+# Dockerfile - image with all Unified Runtime dependencies.
+#
+
+# Pull base image
+FROM registry.hub.docker.com/library/ubuntu:22.04
+
+# Set environment variables
+ENV OS ubuntu
+ENV OS_VER 22.04
+ENV NOTTY 1
+ENV DEBIAN_FRONTEND noninteractive
+
+# Additional parameters to build docker without building components.
+# These ARGs can be set in docker building phase and are used
+# within bash scripts (executed within docker).
+ARG SKIP_DPCPP_BUILD
+ARG SKIP_LIBBACKTRACE_BUILD
+
+# Base development packages
+ARG BASE_DEPS="\
+	build-essential \
+	cmake \
+	git"
+
+# Unified Runtime's dependencies
+ARG UR_DEPS="\
+	doxygen \
+	python3 \
+	python3-pip"
+
+# Unified Runtime's dependencies (installed via pip)
+ARG UR_PYTHON_DEPS="\
+	clang-format==15.0.7"
+
+# Miscellaneous for our builds/CI (optional)
+ARG MISC_DEPS="\
+	clang \
+	sudo \
+	wget \
+	whois"
+
+# Update and install required packages
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+	${BASE_DEPS} \
+	${UR_DEPS} \
+	${MISC_DEPS} \
+ && apt-get clean all
+
+RUN pip3 install ${UR_PYTHON_DEPS}
+
+# Install DPC++
+COPY install_dpcpp.sh install_dpcpp.sh
+ENV DPCPP_PATH=/opt/dpcpp
+RUN ./install_dpcpp.sh
+
+# Install libbacktrace
+COPY install_libbacktrace.sh install_libbacktrace.sh
+RUN ./install_libbacktrace.sh
+
+# Add a new (non-root) 'user'
+ENV USER user
+ENV USERPASS pass
+RUN useradd -m $USER -g sudo -p `mkpasswd $USERPASS`