Update versions and cleanup Dockerfile

Dockerfile

@@ -1,20 +1,18 @@
 # Read the Docs - Environment base
 FROM ubuntu:18.04
-MAINTAINER Read the Docs <support@readthedocs.com>
-LABEL version="4.0.0"
+LABEL mantainer="Read the Docs <support@readthedocs.com>"
+LABEL version="5.0.0rc1"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV APPDIR /app
 ENV LANG C.UTF-8
 
-# Versions, and expose labels for exernal usage
-ENV PYTHON_VERSION_27 2.7.14
-ENV PYTHON_VERSION_35 3.5.5
-ENV PYTHON_VERSION_36 3.6.4
-ENV PYTHON_VERSION_37 3.7.1
-ENV CONDA_VERSION 4.5.11
+# Versions, and expose labels for external usage
+ENV PYTHON_VERSION_27 2.7.15
+ENV PYTHON_VERSION_36 3.6.8
+ENV PYTHON_VERSION_37 3.7.2
+ENV CONDA_VERSION 4.5.12
 LABEL python.version_27=$PYTHON_VERSION_27
-LABEL python.version_35=$PYTHON_VERSION_35
 LABEL python.version_36=$PYTHON_VERSION_36
 LABEL python.version_37=$PYTHON_VERSION_37
 LABEL conda.version=$CONDA_VERSION
@@ -33,9 +31,10 @@ RUN apt-get -y install \
     libsqlite3-dev libtiff5-dev libwebp-dev pandoc pkg-config zlib1g-dev
 
 # pyenv extra requirements
+# https://github.com/pyenv/pyenv/wiki/Common-build-problems
 RUN apt-get install -y \
     make libssl-dev wget llvm libncurses5-dev libncursesw5-dev xz-utils \
-    tk-dev
+    tk-dev liblzma-dev python-openssl
 
 # LaTeX -- split to reduce image layer size
 RUN apt-get -y install texlive-fonts-extra
@@ -48,69 +47,72 @@ RUN apt-get -y install \
     latex-cjk-chinese-arphic-gbsn00lp latex-cjk-chinese-arphic-gkai00mp \
     fonts-symbola
 
-# Install 'rsvg-convert' for SVG -> PDF conversion
+# plantuml: is to support sphinxcontrib-plantuml
+# https://pypi.org/project/sphinxcontrib-plantuml/
+#
+# imagemagick: is to support sphinx.ext.imgconverter
+# http://www.sphinx-doc.org/en/master/usage/extensions/imgconverter.html
+#
+# rsvg-convert: is for SVG -> PDF conversion
 # using Sphinx extension sphinxcontrib.rsvgconverter, see
 # https://github.com/missinglinkelectronics/sphinxcontrib-svg2pdfconverter
-RUN apt-get -y install librsvg2-bin
-
-# Install plantuml
-RUN apt-get -y install plantuml
+#
+# swig: is required for different purposes
+# https://github.com/rtfd/readthedocs-docker-images/issues/15
+RUN apt-get -y install plantuml imagemagick librsvg2-bin swig
 
 # Install Python tools/libs
 RUN apt-get -y install python-pip && pip install -U virtualenv auxlib
 
+# Install jsdoc and typedoc
+RUN apt-get -y install nodejs npm && npm install --global jsdoc typedoc
+
 # UID and GID from readthedocs/user
 RUN groupadd --gid 205 docs
 RUN useradd -m --uid 1005 --gid 205 docs
 
-# Install jsdoc and typedoc
-RUN apt-get -y install nodejs npm && npm install --global jsdoc typedoc
-
 USER docs
 WORKDIR /home/docs
 
 # Install Conda
 RUN curl -O https://repo.continuum.io/miniconda/Miniconda2-${CONDA_VERSION}-Linux-x86_64.sh
 RUN bash Miniconda2-${CONDA_VERSION}-Linux-x86_64.sh -b -p /home/docs/.conda/
 ENV PATH $PATH:/home/docs/.conda/bin
+RUN rm -f Miniconda2-${CONDA_VERSION}-Linux-x86_64.sh
 
 # Install pyenv
-RUN git clone --depth 1 https://github.com/yyuu/pyenv.git ~docs/.pyenv
+RUN wget https://github.com/pyenv/pyenv/archive/master.zip
+RUN unzip master.zip && \
+    rm -f master.zip && \
+    mv pyenv-master ~docs/.pyenv
 ENV PYENV_ROOT /home/docs/.pyenv
 ENV PATH /home/docs/.pyenv/shims:$PATH:/home/docs/.pyenv/bin
 
 # Install supported Python versions
 RUN pyenv install $PYTHON_VERSION_27 && \
     pyenv install $PYTHON_VERSION_37 && \
     pyenv install $PYTHON_VERSION_36 && \
-    pyenv install $PYTHON_VERSION_35 && \
     pyenv global \
         $PYTHON_VERSION_27 \
         $PYTHON_VERSION_37 \
-        $PYTHON_VERSION_36 \
-        $PYTHON_VERSION_35
+        $PYTHON_VERSION_36
 
 WORKDIR /tmp
 
 RUN pyenv local $PYTHON_VERSION_27 && \
-    pyenv exec pip install -U pip && \
-    pyenv exec pip install --only-binary numpy,scipy numpy scipy && \
-    pyenv exec pip install pandas matplotlib virtualenv
+    pyenv exec pip install --no-cache-dir -U pip && \
+    pyenv exec pip install --no-cache-dir --only-binary numpy,scipy numpy scipy && \
+    pyenv exec pip install --no-cache-dir pandas matplotlib virtualenv
 
 RUN pyenv local $PYTHON_VERSION_37 && \
-    pyenv exec pip install -U pip && \
-    pyenv exec pip install --only-binary numpy,scipy numpy scipy && \
-    pyenv exec pip install pandas matplotlib virtualenv
+    pyenv exec pip install --no-cache-dir -U pip && \
+    pyenv exec pip install --no-cache-dir --only-binary numpy,scipy numpy scipy && \
+    pyenv exec pip install --no-cache-dir pandas matplotlib virtualenv
 
 RUN pyenv local $PYTHON_VERSION_36 && \
-    pyenv exec pip install -U pip && \
-    pyenv exec pip install --only-binary numpy,scipy numpy scipy && \
-    pyenv exec pip install pandas matplotlib virtualenv
-
-RUN pyenv local $PYTHON_VERSION_35 && \
-    pyenv exec pip install -U pip && \
-    pyenv exec pip install --only-binary numpy,scipy numpy scipy && \
-    pyenv exec pip install pandas matplotlib virtualenv
+    pyenv exec pip install --no-cache-dir -U pip && \
+    pyenv exec pip install --no-cache-dir --only-binary numpy,scipy numpy scipy && \
+    pyenv exec pip install --no-cache-dir pandas matplotlib virtualenv
 
 WORKDIR /