add CI build scripts

Dockerfile

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+# fog-sw BUILDER
+FROM ros:foxy-ros-base as fog-sw-builder
+
+# Install build dependencies
+RUN apt-get update -y && apt-get install -y --no-install-recommends \
+    curl \
+    build-essential \
+    dh-make debhelper \
+    cmake \
+    git-core \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /build
+
+COPY . .
+
+RUN /bin/bash -c "source /opt/ros/foxy/setup.bash && \
+    apt-get update && \
+    rosdep update && \
+    rosdep install --from-paths . --ignore-src -r -y && \
+    colcon build && \
+    mkdir /packages && cd install && \
+    find . -name '*.so' -exec cp --parents \{\} /packages \;"
+
+FROM scratch
+COPY --from=fog-sw-builder /packages/ /packages/

build.sh

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+#!/bin/bash
+
+set -euxo pipefail
+
+THISDIR="$(dirname "$(readlink -f "$0")")"
+
+output_dir=$1
+output="${output_dir}/gazebo_ros_pkgs"
+mkdir -p "${output}"
+
+pushd "${THISDIR}"
+git_version=$(git log --date=format:%Y%m%d --pretty=~git%cd.%h -n 1)
+
+iname=gazebo-ros-pkgs
+docker build -t "${iname}" -f ./Dockerfile .
+container_id=$(docker create "${iname}" "")
+docker cp "${container_id}":/packages .
+docker rm "${container_id}"
+cp -r packages/* "${output}"
+rm -Rf packages
+
+pushd "${output_dir}"
+tar -zcvf "gazebo_ros_pkgs-0.1.0${git_version}.tar.gz" ./gazebo_ros_pkgs
+rm -rf ./gazebo_ros_pkgs
+popd
+popd