Add Dockerfile

Dockerfile

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+FROM gcc:9
+
+RUN curl https://cmake.org/files/v3.17/cmake-3.17.0-Linux-x86_64.sh -o /tmp/curl-install.sh \
+      && chmod u+x /tmp/curl-install.sh \
+      && mkdir /usr/bin/cmake \
+      && /tmp/curl-install.sh --skip-license --prefix=/usr/bin/cmake \
+      && rm /tmp/curl-install.sh \
+      && curl https://bootstrap.pypa.io/get-pip.py -o /tmp/get-pip.py \
+      && python /tmp/get-pip.py --no-wheel \
+      && rm /tmp/get-pip.py \
+      && pip install gcovr
+ENV PATH="/usr/bin/cmake/bin:${PATH}"
+RUN curl -Lj0 https://github.com/google/googletest/archive/release-1.10.0.zip -o /tmp/gtest.zip \
+      && cd /tmp \
+      && unzip gtest.zip \
+      && cd googletest-release-1.10.0 \
+      && cmake  -DBUILD_SHARED_LIBS=ON . \
+      && make \
+      && make install \
+      && cd .. \
+      && rm gtest.zip \
+      && rm -rf googletest-release-1.10.0 \
+