Merge branch 'localdev' into 'next'

switch to miniconda image

See merge request !13

src/Dockerfile

-FROM code.ornl.gov:4567/rse/images/centos:7
-
-ENV PYTHONUNBUFFERED 1
-ENV CFLAGS "-std=c++11"
-ENV LANG en_US.UTF-8
-ENV LANGUAGE en_US.UTF-8
-ENV LC_COLLATE C
-ENV LC_CTYPE en_US.UTF-8
-
-RUN yum install -y epel-release; \
-    yum groupinstall -y "development tools"; \
-    yum install -y yum install -y openldap-devel python3 python3-devel postgresql postgresql-devel; \
-    yum clean all; rm -rf /var/cache/yum    
-
-WORKDIR /var/www/web_reflectivity/app
-
-COPY . .
-
-RUN python3 -m pip install --upgrade pip; \
-    python3 -m pip install -r requirements.txt 
+# latest miniconda3 image
+FROM continuumio/miniconda3
+
+ENV PYTHONUNBUFFERED 1
+ENV CFLAGS "-std=c++11"
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US.UTF-8
+ENV LC_COLLATE C
+ENV LC_CTYPE en_US.UTF-8
+
+# This line will throw error if using an old miniconda3 image.
+# To correct, one must build a miniconda3 image while piling all apt-get statements together into one
+# https://hub.docker.com/r/continuumio/miniconda3/dockerfile
+RUN apt-get update && apt-get install -y postgresql postgresql-contrib
+
+WORKDIR /var/www/web_reflectivity/app
+
+COPY . .
+
+RUN conda install --name base -c conda-forge mamba
+
+RUN mamba env update --name base --file environment.yml