Add step to copy init files

Always copy the files in /docker-entrypoint.d automatically, otherwise
users need to explicitly add a `COPY` step in the `ckan/Dockerfile`,
which is confusing

ckan/Dockerfile

@@ -5,6 +5,10 @@ ENV APP_DIR=/srv/app
 ENV TZ=UTC
 RUN echo ${TZ} > /etc/timezone
 
+
+# Copy custom initialization scripts
+COPY docker-entrypoint.d/* /docker-entrypoint.d/
+
 # Make sure both files are not exactly the same
 RUN if ! [ /usr/share/zoneinfo/${TZ} -ef /etc/localtime ]; then \
         cp /usr/share/zoneinfo/${TZ} /etc/localtime ;\

ckan/Dockerfile.dev

@@ -44,9 +44,11 @@ RUN if ! [ /usr/share/zoneinfo/${TZ} -ef /etc/localtime ]; then \
 # Clone the extension(s) your are writing for your own project in the `src` folder
 # to get them mounted in this image at runtime
 
+# Copy custom initialization scripts
+COPY docker-entrypoint.d/* /docker-entrypoint.d/
+
 # Apply any patches needed to CKAN core or any of the built extensions (not the
 # runtime mounted ones)
-
 COPY patches ${APP_DIR}/patches
 
 RUN for d in $APP_DIR/patches/*; do \

ckan/docker-entrypoint.d/README.md

@@ -0,0 +1,4 @@
+Use scripts in this folder to run extra initialization steps in your custom CKAN images.
+Any file with `.sh` or `.py` extension will be executed just after the main initialization
+script (`prerun.py`) is executed and just before the web server and supervisor processes are
+started.