add ccache in Dockerfile

docker/build_env/cpu/ubuntu16.04/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget ca-certifi
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     wget -qO- "https://cmake.org/files/v3.14/cmake-3.14.3-Linux-x86_64.tar.gz" | tar --strip-components=1 -xz -C /usr/local && \
     apt-get update && apt-get install -y --no-install-recommends \
-    g++ git gfortran lsb-core \
+    g++ git gfortran lsb-core ccache \
     libboost-serialization-dev libboost-filesystem-dev libboost-system-dev libboost-regex-dev \
     curl libtool automake libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \

docker/build_env/cpu/ubuntu18.04/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget ca-certifi
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     wget -qO- "https://cmake.org/files/v3.14/cmake-3.14.3-Linux-x86_64.tar.gz" | tar --strip-components=1 -xz -C /usr/local && \
     apt-get update && apt-get install -y --no-install-recommends \
-    g++ git gfortran lsb-core \
+    g++ git gfortran lsb-core ccache \
     libboost-serialization-dev libboost-filesystem-dev libboost-system-dev libboost-regex-dev \
     curl libtool automake libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \

docker/build_env/gpu/ubuntu16.04/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget && \
     apt-key add /tmp/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2019.PUB && \
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     apt-get update && apt-get install -y --no-install-recommends \
-    git flex bison gfortran lsb-core \
+    git flex bison gfortran lsb-core ccache \
     curl libtool automake libboost1.58-all-dev libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \
     lcov mysql-client libmysqlclient-dev intel-mkl-gnu-2019.5-281 intel-mkl-core-2019.5-281 && \

docker/build_env/gpu/ubuntu18.04/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget && \
     apt-key add /tmp/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2019.PUB && \
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     apt-get update && apt-get install -y --no-install-recommends \
-    git flex bison gfortran lsb-core \
+    git flex bison gfortran lsb-core ccache \
     curl libtool automake libboost-all-dev libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \
     lcov mysql-client libmysqlclient-dev intel-mkl-gnu-2019.5-281 intel-mkl-core-2019.5-281 && \