Merge pull request #3 from occrp/master

DISCOURSE_ADDITIONAL_PLUGINS build arg

Dockerfile

@@ -47,5 +47,18 @@ RUN git clone --branch v${DISCOURSE_VERSION} https://github.com/discourse/discou
  && bundle config build.nokogiri --use-system-libraries \
  && bundle install --deployment --without test --without development
 
+
+# install discourse plugins
+# assumptions: no spaces in URLs (urlencoding is a thing)
+# 
+# this expects a git-cloneable link
+ARG DISCOURSE_ADDITIONAL_PLUGINS=
+RUN if [ "$DISCOURSE_ADDITIONAL_PLUGINS" != "" ]; then \
+        cd plugins/; \
+        for PACKAGE_LINK in $DISCOURSE_ADDITIONAL_PLUGINS; do \
+            git clone "$PACKAGE_LINK"; \
+        done; \
+    fi
+
 EXPOSE 3000
 CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]

README.md

 # docker-discourse
+
 discourse image for discourse service
+
+## Discourse plugins
+
+This image supports installing Discourse plugins at build time, via the `DISCOURSE_ADDITIONAL_PLUGINS` [build arg](https://docs.docker.com/engine/reference/builder/#/arg). Set it to a whitespace (space, tab, newline) separated list if valid `git` URLs of plugins to be installed at build time.
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