add drone config [ci skip]

.drone/after-success.sh

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+#!/bin/bash
+
+

.drone/before-install.sh

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+#!/bin/bash
+
+

.drone/before-script.sh

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+#!/bin/bash
+
+

.drone/boost.sh

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+#!/bin/bash
+
+set -ex
+export TRAVIS_BUILD_DIR=$(pwd)
+export DRONE_BUILD_DIR=$(pwd)
+export TRAVIS_BRANCH=$DRONE_BRANCH
+export VCS_COMMIT_ID=$DRONE_COMMIT
+export GIT_COMMIT=$DRONE_COMMIT
+export REPO_NAME=$DRONE_REPO
+export PATH=~/.local/bin:/usr/local/bin:$PATH
+
+echo '==================================> BEFORE_INSTALL'
+
+. .drone/before-install.sh
+
+echo '==================================> INSTALL'
+
+GIT_FETCH_JOBS=8
+BOOST_BRANCH=develop
+if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
+cd ..
+git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+cd boost-root
+git submodule init tools/boostdep
+git submodule init tools/build
+git submodule init tools/boost_install
+git submodule init libs/headers
+git submodule init libs/config
+git submodule update --jobs $GIT_FETCH_JOBS
+cp -r $TRAVIS_BUILD_DIR/* libs/integer
+python tools/boostdep/depinst/depinst.py --git_args "--jobs $GIT_FETCH_JOBS" integer
+./bootstrap.sh
+./b2 headers
+
+echo '==================================> BEFORE_SCRIPT'
+
+. $DRONE_BUILD_DIR/.drone/before-script.sh
+
+echo '==================================> SCRIPT'
+
+echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
+BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
+./b2 -j $BUILD_JOBS libs/integer/test toolset=$TOOLSET cxxstd=$CXXSTD ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined define=UBSAN=1 debug-symbols=on visibility=global} ${CXXFLAGS:+cxxflags="$CXXFLAGS"} ${LINKFLAGS:+linkflags="$LINKFLAGS"}
+
+echo '==================================> AFTER_SUCCESS'
+
+. $DRONE_BUILD_DIR/.drone/after-success.sh