container: general purpose multiarch docker

* new docker container using ubuntu focal (20.04)
* adds nuttx building for any supported target
* adds initial support for gazebo simulation via X11
* updates docker_run.sh script to initialize container
* NEEDS: updated ubuntu.sh script

How to run:
```
./Tools/docker_run.sh make all_variants_px4_fmu-v5x
```

Tools/docker_run.sh

@@ -1,35 +1,5 @@
 #! /bin/bash
 
-if [ -z ${PX4_DOCKER_REPO+x} ]; then
-	echo "guessing PX4_DOCKER_REPO based on input";
-	if [[ $@ =~ .*px4_fmu.* ]]; then
-		# nuttx-px4fmu-v{1,2,3,4,5}
-		PX4_DOCKER_REPO="px4io/px4-dev-nuttx-focal:2021-09-08"
-	elif [[ $@ =~ .*navio2.* ]] || [[ $@ =~ .*raspberry.* ]] || [[ $@ =~ .*beaglebone.* ]] || [[ $@ =~ .*pilotpi.default ]]; then
-		# beaglebone_blue_default, emlid_navio2_default, px4_raspberrypi_default, scumaker_pilotpi_default
-		PX4_DOCKER_REPO="px4io/px4-dev-armhf:2021-08-18"
-	elif [[ $@ =~ .*pilotpi.arm64 ]]; then
-		# scumaker_pilotpi_arm64
-		PX4_DOCKER_REPO="px4io/px4-dev-aarch64:latest"
-	elif [[ $@ =~ .*navio2.* ]] || [[ $@ =~ .*raspberry.* ]] || [[ $@ =~ .*bebop.* ]]; then
-		# posix_rpi_cross, posix_bebop_default
-		PX4_DOCKER_REPO="px4io/px4-dev-armhf:2021-08-18"
-	elif [[ $@ =~ .*clang.* ]] || [[ $@ =~ .*scan-build.* ]]; then
-		# clang tools
-		PX4_DOCKER_REPO="px4io/px4-dev-clang:2021-02-04"
-	elif [[ $@ =~ .*tests* ]]; then
-		# run all tests with simulation
-		PX4_DOCKER_REPO="px4io/px4-dev-simulation-bionic:2021-12-11"
-	fi
-else
-	echo "PX4_DOCKER_REPO is set to '$PX4_DOCKER_REPO'";
-fi
-
-# otherwise default to nuttx
-if [ -z ${PX4_DOCKER_REPO+x} ]; then
-	PX4_DOCKER_REPO="px4io/px4-dev-nuttx-focal:2021-09-08"
-fi
-
 # docker hygiene
 
 #Delete all stopped containers (including data-only containers)
@@ -38,30 +8,15 @@ fi
 #Delete all 'untagged/dangling' (<none>) images
 #docker rmi $(docker images -q -f dangling=true)
 
-echo "PX4_DOCKER_REPO: $PX4_DOCKER_REPO";
+PX4_DOCKER_REPO="px4io/px4-dev"
 
 PWD=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 SRC_DIR=$PWD/../
 
-CCACHE_DIR=${HOME}/.ccache
-mkdir -p "${CCACHE_DIR}"
-
 docker run -it --rm -w "${SRC_DIR}" \
-	--env=AWS_ACCESS_KEY_ID \
-	--env=AWS_SECRET_ACCESS_KEY \
-	--env=BRANCH_NAME \
-	--env=CCACHE_DIR="${CCACHE_DIR}" \
-	--env=CI \
-	--env=CODECOV_TOKEN \
-	--env=COVERALLS_REPO_TOKEN \
-	--env=LOCAL_USER_ID="$(id -u)" \
-	--env=PX4_ASAN \
-	--env=PX4_MSAN \
-	--env=PX4_TSAN \
-	--env=PX4_UBSAN \
-	--env=TRAVIS_BRANCH \
-	--env=TRAVIS_BUILD_ID \
-	--publish 14556:14556/udp \
-	--volume=${CCACHE_DIR}:${CCACHE_DIR}:rw \
-	--volume=${SRC_DIR}:${SRC_DIR}:rw \
-	${PX4_DOCKER_REPO} /bin/bash -c "$1 $2 $3"
+  --env=LOCAL_USER_ID="$(id -u)" \
+  --publish 14556:14556/udp \
+  --volume=/tmp/.X11-unix:/tmp/.X11-unix \
+  --volume=/tmp:/tmp:rw \
+  --volume=${SRC_DIR}:${SRC_DIR}:rw \
+  ${PX4_DOCKER_REPO} /bin/bash -c "$1 $2 $3"

Tools/setup/Dockerfile

@@ -0,0 +1,55 @@
+#
+# PX4 base development environment
+#
+
+FROM ubuntu:20.04
+LABEL maintainer="Daniel Agar <daniel@agar.ca>, Ramon Roche <mrpollo@gmail.com>"
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
+# Installing required utilities
+RUN apt-get update && apt-get -y --quiet --no-install-recommends install \
+  ca-certificates \
+  gnupg \
+  lsb-core \
+  lsb-release \
+  sudo \
+  software-properties-common \
+  wget \
+  gosu \
+  ;
+
+# Install PX4 Requirements
+COPY Tools/setup/requirements.txt /tmp/requirements.txt
+COPY Tools/setup/ubuntu.sh /tmp/ubuntu.sh
+# We support pre-downloading the gcc arm none eabi compiler
+# to speed up build times, if the file is not present when
+# building, the ubuntu.sh script will download it from source
+COPY *gcc-arm-none-eabi-9-2020-q2-update-linux.tar.bz2 /tmp/gcc-arm-none-eabi-9-2020-q2-update-linux.tar.bz2
+# The PATH env is set within ubuntu.sh, but given how we
+# are running the image using `gosu` to avoid read-only problems
+# with the filesystem the env variable does not persist
+ENV PATH="/opt/gcc-arm-none-eabi-9-2020-q2-update/bin:$PATH"
+ENV PATH="/opt/jdk-14.0.2+12/bin:$PATH"
+RUN bash /tmp/ubuntu.sh --from-docker --with-java --with-rtps
+
+ENV DISPLAY :99
+
+ENV FASTRTPSGEN_DIR="/usr/local/bin/"
+ENV TERM=xterm
+ENV TZ=UTC
+
+# SITL UDP PORTS
+EXPOSE 14556/udp
+EXPOSE 14557/udp
+
+# create user with id 1001 (jenkins docker workflow default)
+RUN useradd --shell /bin/bash -u 1001 -c "" -m user && usermod -a -G dialout user
+
+# create and start as LOCAL_USER_ID
+COPY Tools/setup/docker-entrypoint.sh /usr/local/bin/entrypoint.sh
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+
+CMD ["/bin/bash"]

Tools/setup/docker-entrypoint.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Start virtual X server in the background
+# - DISPLAY default is :99, set in dockerfile
+# - Users can override with `-e DISPLAY=` in `docker run` command to avoid
+#   running Xvfb and attach their screen
+if [[ -x "$(command -v Xvfb)" && "$DISPLAY" == ":99" ]]; then
+	echo "Starting Xvfb"
+	Xvfb :99 -screen 0 1600x1200x24+32 &
+fi
+
+# Check if the ROS_DISTRO is passed and use it
+# to source the ROS environment
+if [ -n "${ROS_DISTRO}" ]; then
+	source "/opt/ros/$ROS_DISTRO/setup.bash"
+fi
+
+# Use the LOCAL_USER_ID if passed in at runtime
+if [ -n "${LOCAL_USER_ID}" ]; then
+	echo "Starting with UID : $LOCAL_USER_ID"
+	# modify existing user's id
+	usermod -u $LOCAL_USER_ID user
+
+	# run as user
+  exec gosu user "$@"
+else
+	exec "$@"
+fi