Build python3.7 from source instead

Note that this increases the build time to ~20-30 minutes on my PC.
disabling python's optimizations (see dockerfile) will lower this
to ~3-4 minutes, your experience may vary.

CFD.Dockerfile

@@ -2,9 +2,22 @@ FROM frehbach/cfd-test-problem-suite
 
 # Install python 3.7
 RUN apt-get install -y software-properties-common &&\
-    add-apt-repository ppa:deadsnakes/ppa &&\
     apt-get update &&\
-    apt-get install -y build-essential python3-pip python3.7 python3.7-dev swig &&\
+    apt-get install -y build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev &&\
+    wget https://www.python.org/ftp/python/3.7.10/Python-3.7.10.tgz &&\
+    tar -xf Python-3.7.10.tgz &&\
+    cd Python-3.7.10 &&\
+    # With optimizations takes longer to build, but given the time senstive nature of the benchmarks
+    # it is likely good to enable them.
+    ./configure --enable-optimizations --with-ensurepip=install &&\
+    # Alternatively, for testing if things work at all:
+    # ./configure --with-ensurepip=install &&\
+    make -j 4 &&\
+    make altinstall &&\
+    cd .. &&\
+    # apt-get install -y python3-pip python3.7 python3.7-dev swig &&\
+    python3.7 -m ensurepip --default-pip &&\
+    apt-get install -y swig &&\
     python3.7 -m pip install --upgrade pip &&\
     python3.7 -m pip install --upgrade cython setuptools wheel