Make it possible to patch build templates

Thus, build templates are no longer copied, but rendered.

CHANGELOG.md

@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Latest
 
+- [Feature] Make it possible for plugins to patch the build templates
 - [Improvement] Move Xqueue and Student notes to a dedicated plugin
 
 ## 3.4.3 (2019-06-24)

tutor/env.py

@@ -102,11 +102,10 @@ def render_full(root, config):
     """
     Render the full environment, including version information.
     """
-    for subdir in ["android", "apps", "k8s", "local", "webui"]:
+    for subdir in ["android", "apps", "build", "k8s", "local", "webui"]:
         save_subdir(subdir, root, config)
     for plugin, path in plugins.iter_templates(config):
         save_plugin_templates(plugin, path, root, config)
-    copy_subdir("build", root)
     save_file(VERSION_FILENAME, root, config)
     save_file("kustomization.yml", root, config)
 

tutor/templates/build/openedx/Dockerfile

@@ -69,6 +69,8 @@ COPY settings/cms/*.py ./cms/envs/tutor/
 COPY ./bin /openedx/bin
 ENV PATH /openedx/bin:${PATH}
 
+{{ patch("openedx-dockerfile-pre-assets") }}
+
 # Collect production assets. By default, only assets from the default theme
 # will be processed. This makes the docker image lighter and faster to build.
 # Only the custom themes added to /openedx/themes will be compiled.
@@ -91,6 +93,8 @@ RUN mkdir /openedx/data
 ENV SERVICE_VARIANT lms
 ENV SETTINGS tutor.production
 
+{{ patch("openedx-dockerfile") }}
+
 # Entrypoint will fix permissions of all files and run commands as openedx
 ENTRYPOINT ["docker-entrypoint.sh"]