docker for beam-node: fix build issue

docker/beam-node/main-release-mining/Dockerfile

@@ -16,26 +16,25 @@ CMD ["/sbin/my_init"]
 # use aliyun source
 ADD sources-aliyun.com.list /etc/apt/sources.list
 
-RUN apt-get update
-RUN apt-get install -y build-essential libtool pkg-config libssl-dev
-RUN apt-get install -y libboost-all-dev curl wget unzip git cmake
+RUN apt-get update && apt-get install -y build-essential libtool pkg-config libssl-dev libboost-all-dev curl wget unzip git && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 
-# build bitcoind
-RUN mkdir /work
-RUN cd /work && git clone -b mining-hard-fork --depth 1 https://github.com/btccom/beam.git
+# download cmake
+RUN cd /usr/local && \
+    wget https://github.com/Kitware/CMake/releases/download/v3.15.1/cmake-3.15.1-Linux-x86_64.tar.gz && \
+    tar zxf cmake-3.15.1-Linux-x86_64.tar.gz --strip-components=1 && \
+    rm cmake-3.15.1-Linux-x86_64.tar.gz
+
+# build beam-node
+RUN mkdir /work && cd /work && git clone -b mining-hard-fork --depth 1 https://github.com/btccom/beam.git
 RUN cd /work/beam \
   && cmake -DCMAKE_BUILD_TYPE=Release -DBEAM_NO_QT_UI_WALLET=ON . \
   #&& make && make install
   && make -j$(nproc)
 
-# mkdir bitcoind data dir
-RUN mkdir -p /work/beam-node
-
-#
-# services
-#
+# mkdir dirs
+RUN mkdir -p /work/beam-node /etc/service/beam-node
 
-# service for mainnet
-RUN mkdir    /etc/service/beam-node
 ADD run      /etc/service/beam-node/run
 RUN chmod +x /etc/service/beam-node/run