Several change to mailman-web image.

- Download source code as zip from gitlab instead of git+https because speed.
- Check if the $DATABASE_URL is not defined, use a default sqlite database.
- Use dj-database-url package to set database in django settings using
  DATABASE_URL environment variable.
- Use UWSGI_LOG_URL as the URL for UWSGI logging and set it to a default value
  if it has not been defined.

web/Dockerfile

@@ -2,17 +2,27 @@ FROM python:2.7
 
 MAINTAINER Abhilash Raj
 
+ENV DEBIAN_FRONTEND=noninteractive
+
 RUN apt-get update \
 	&& apt-get install -y ruby-sass \
-					   git \
-					   postgresql-client \
-	&& python -m pip install git+https://gitlab.com/mailman/mailmanclient.git \
-		   		   git+https://gitlab.com/mailman/postorius.git \
-				   git+https://gitlab.com/mailman/django-mailman3.git \
-				   git+https://gitlab.com/mailman/hyperkitty.git \
-				   whoosh \
-				   uwsgi \
-				   psycopg2
+					   wget \
+					   postgresql-client
+
+RUN wget -O mailmanclient.zip https://gitlab.com/mailman/mailmanclient/repository/archive.zip?ref=master \
+	&& wget -O postorius.zip https://gitlab.com/mailman/postorius/repository/archive.zip?ref=master \
+	&& wget -O django-mailman3.zip https://gitlab.com/mailman/django-mailman3/repository/archive.zip?ref=master \
+	&& wget -O hyperkitty.zip https://gitlab.com/mailman/hyperkitty/repository/archive.zip?ref=master \
+    && python -m pip install mailmanclient.zip \
+	                         postorius.zip \
+							 django-mailman3.zip \
+							 hyperkitty.zip \
+		  				     whoosh \
+				             uwsgi \
+				             psycopg2 \
+				             dj-database-url \
+							 pymysql \
+	&& rm mailmanclient.zip postorius.zip hyperkitty.zip django-mailman3.zip
 
 ADD mailman-web /opt/mailman-web