Add Linux Docker test matrix

Author: madmongo1

.dockerignore

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+# ignore cmake builds
+cmake-build-*/
+
+# ignore b2 builds
+bin.v2/
+*/bin.v2/
+.git/
+*/.git/

.dockers/fedora-32/Dockerfile

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+FROM fedora:32
+
+RUN dnf update -y
+RUN dnf -y groupinstall "Development Tools"
+RUN dnf install -y cmake openssl-devel clang libcxx-devel libcxxabi-devel bzip2-devel which zlib-devel
+
+WORKDIR /devel
+RUN git clone -b develop https://github.com/boostorg/boost.git
+COPY .dockers/fedora-32/user-config.jam /devel/boost/
+COPY .dockers/fedora-32/tests.sh /devel/boost/
+
+WORKDIR /devel/boost
+RUN git submodule update --init --recursive
+COPY Jamfile /devel/boost/libs/beast/
+COPY doc /devel/boost/libs/beast/doc/
+COPY example /devel/boost/libs/beast/example/
+COPY meta /devel/boost/libs/beast/meta/
+COPY tools /devel/boost/libs/beast/tools/
+
+#RUN cd libs/beast && git checkout develop && git pull origin develop
+RUN ./bootstrap.sh
+RUN ./b2 toolset=gcc variant=release cxxstd=latest headers
+RUN ./tests.sh

.dockers/fedora-32/tests.sh

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+#!/usr/bin/env bash
+
+set -e
+
+./b2 --user-config=./user-config.jam \
+  toolset=clang,gcc \
+  asio.mode=dflt,nodep,nots,ts,nodep-nots,nodep-ts \
+  variant=release \
+  cxxstd=2a,17,14,11 \
+  -j`grep processor /proc/cpuinfo | wc -l` \
+  -q \
+  libs/beast/test libs/beast/example

.dockers/fedora-32/user-config.jam

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+import feature ;
+
+feature.feature asio.mode : dflt nodep nots ts nodep-nots nodep-ts : propagated composite ;
+feature.compose <asio.mode>nodep : <define>"BOOST_ASIO_NO_DEPRECATED" ;
+feature.compose <asio.mode>nots : <define>"BOOST_ASIO_NO_TS_EXECUTORS" ;
+feature.compose <asio.mode>ts : <define>"BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT" ;
+feature.compose <asio.mode>nodep-nots : <define>"BOOST_ASIO_NO_DEPRECATED" <define>"BOOST_ASIO_NO_TS_EXECUTORS" ;
+feature.compose <asio.mode>nodep-ts : <define>"BOOST_ASIO_NO_DEPRECATED" <define>"BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT" ;
+
+using clang :   : clang++ : <stdlib>"libc++" <cxxflags>"-Wno-c99-extensions" ;
+using gcc :   : g++ : <cxxflags>"-Wno-c99-extensions" ;