Add instructions on releasing to README (#286)

Author: fsteeg

README.md

@@ -109,6 +109,18 @@ Run workflows on the web server, passing `data`, `flux`, and `fix`:
 
 [http://localhost:8080/xtext-service/run?data='1'{'a': '5', 'z': 10}&flux=as-lines|decode-formeta|fix|encode-formeta(style="multiline")&fix=map(a,b) map(\_else)](http://localhost:8080/xtext-service/run?data=%271%27{%27a%27:%20%275%27,%20%27z%27:%2010}&flux=as-lines|decode-formeta|fix|encode-formeta(style=%22multiline%22)&fix=map(a,c)%20map(\_else))
 
+## Releasing
+
+Create a release and packages on GitHub:
+
+- Change the `version` in `build.gradle`: remove `-SNAPSHOT`
+- Commit and tag that state (e.g. `git tag 0.4.0`), push the tag (e.g. `git push origin 0.4.0`)
+- Push that state to the `publish` branch to create GitHub packages: `git push origin master:publish`
+- Create a local runner distribution: `./gradlew distZip`
+- Create a release on GitHub: https://github.com/metafacture/metafacture-fix/releases, choose the new tag
+- Attach the runner zip from `metafacture-fix/metafix-runner/build/distributions`
+- Update the `version` in `build.gradle`: increase number, add `-SNAPSHOT`
+
 ## Functions and cookbook
 
 ### Best practices and guidelines for working with Metafacture Fix