Update Dockerfile

Author: EricR86

docker/Dockerfile

@@ -1,22 +1,19 @@
 FROM ubuntu:latest
 
-# Install Ubuntu 20.04.01 LTS
+# Install Latest Ubuntu LTS
 # Install pkg-config for GMTK
-# Install Python 3 and pip3
-# Install HDF5
-# Install Git
 # Install curl (for retrieving GMTK)
+# Install HDF5 (for genomedata dependency)
+# Install git for github actions checkout to function properly
 # Avoid prompts and do not install recommended packages
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
     build-essential \
     pkg-config \
-    python3 \
-    python3-venv \
-    python3-pip \
     libhdf5-serial-dev \
     hdf5-tools \
-    git \
+    ca-certificates \
     curl \
+    git \
 && apt-get clean \
 && rm -rf /var/lib/apt/lists/*
 
@@ -25,7 +22,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-ins
 # Ubuntu 20.04 defaults to a more recent c++ version; need to specify c++11 with CXXFLAGS
 # TODO: Check to see if the image would be smaller if using ADD of the URL,
 # skipping install of curl and then using RUN for the remaining gmtk commands
-# Previous download location: http://melodi.ee.washington.edu/downloads/gmtk/gmtk-1.4.4.tar.gz 
+# Previous download location: http://melodi.ee.washington.edu/downloads/gmtk/gmtk-1.4.4.tar.gz
 # New (temporary?) location: https://depot.galaxyproject.org/software/gmtk/gmtk_1.4.4_src_all.tar.gz
 RUN curl -SL https://depot.galaxyproject.org/software/gmtk/gmtk_1.4.4_src_all.tar.gz \
     | tar -xz \
@@ -36,12 +33,5 @@ RUN curl -SL https://depot.galaxyproject.org/software/gmtk/gmtk_1.4.4_src_all.ta
     && cd .. \
     && rm -rf gmtk-1.4.4
 
-# Update pip
-# Install PyFlakes for testing
-RUN python3 -m pip install --upgrade \
-    build \
-    pip \
-    setuptools
-
-# Install segway
+# Let CI machines manage Python and segway installation
 # RUN pip install segway