Document Docker Store release process.

docs/release-process.md

@@ -127,6 +127,20 @@ Finally, for **Mainline** releases only:
 
 * Images tagged `latest` are updated on DockerHub
 
+### Docker Store
+
+Weave Net is [available in Docker Store](https://store.docker.com/plugins/weave-net-plugin) and should also be released there.
+
+* Go to https://store.docker.com/ and log in.
+* Go to "[_Publish_](https://store.docker.com/publisher/center)".
+* Under "_My Products_", select "_owners (weaveworks)_". Weave Net should be listed among our products.
+* Click "_Actions_" > "_Edit Product_".
+* Go to "_Plans & Pricing_" > "_Free Tier_".
+* Under "_Source Repositories & Tags", click on "_Add Source_", select "_net-plugin_" under "_Repository_" and the version to release under "_Tag_".
+* Under "_Resources_" > "_Installation Instructions_", update the lines containing `export NET_VERSION=<version>`.
+* Click "_Submit For Review_". You should see a message like: "_Your product has been submitted for approval. [...] We'll be in touch with next steps soon!_".
+* Hope Docker eventually contacts us and/or performs the release. If nothing happens within a couple days, contact their support team: support@docker.com
+
 ### Finish up
 
 * If not on master, merge branch into master and push to GitHub.