Re-adding building from source CMake 3 for Ubuntu 14 build of the NRP and the policy packages (#778)

Author: MariusNi

devops/docker/ubuntu-14.04-amd64/Dockerfile

@@ -5,8 +5,11 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get -y update && apt-get -y install \ 
     gcc \
     git \
-    cmake \
     build-essential \
     file
 
-WORKDIR /git
+WORKDIR /git
+
+# CMake
+RUN git clone https://github.com/Kitware/CMake --recursive -b v3.21.7
+RUN cd CMake && ./bootstrap -- -DCMAKE_USE_OPENSSL=OFF && make -j$(nproc) && make install && hash -r && rm -rf /git/CMake