docker: add entrypoint and add support for dynamic config

Dockerfile

@@ -27,3 +27,6 @@ COPY requirements.txt ./
 RUN LIBRARY_PATH=/lib:/usr/lib /bin/sh -c "pip install --no-cache-dir -r requirements.txt"
 
 COPY ./ .
+COPY entrypoint.sh /
+
+ENTRYPOINT ["/entrypoint.sh" ]

dynamicweb/settings/base.py

@@ -777,3 +777,9 @@ if DEBUG:
     from .local import *  # flake8: noqa
 else:
     from .prod import *  # flake8: noqa
+
+# Try to load dynamic configuration, if it exists
+try:
+    from .dynamic import * # flake8: noqa
+except ImportError:
+    pass

entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -uex
+
+cd /usr/src/app/
+cat > dynamicweb/settings/dynamic.py <<EOF
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.postgresql_psycopg2',
+        'NAME': '${POSTGRES_DB}',
+        'USER': '${POSTGRES_USER}',
+        'PASSWORD': '${POSTGRES_PASSWORD}',
+        'HOST': '${POSTGRES_HOST}',
+        'PORT': '5432',
+    }
+}
+EOF
+
+exec "$@"