add how-to-release description ConSol#75

README.md

@@ -135,6 +135,9 @@ If you open some graphic/work intensive websites in the Docker container (especi
 
 Thx @raghavkarol for the hint! 
 
+## How to release
+See **[how-to-release.md](./how-to-release.md)**
+
 ## Contributors
 
 At this point we want to thank all contributors, which helped to move this great project by submitting code, writing documentation, or adapting other tools to play well together with the docker headless container.

how-to-release.md

@@ -0,0 +1,20 @@
+# How to release
+
+* Check if `changelog.md` is correct
+* Check if all features are merged in dev and pushed
+* Pull the latest `dev` images
+
+      .build/tag_image.sh dev 1.x.x --save
+
+* Test if the latest `dev` build is usable
+  * Change the the `FROM` statement in Sakuli `Dockerfile` to `dev` tag (in separate branch) and run (after build on dockerhub) [`docker/.build/tag_image.sh --save`](https://github.com/ConSol/sakuli/blob/master/docker/.build/tag_image.sh)  
+
+* On success - push the tested `dev` images to dockerhub
+
+      .build/tag_image.sh dev 1.x.x
+      .build/tag_image.sh dev latest
+
+* Merge `dev` branch to `master`
+
+* Create a release on [github.com/ConSol/docker-headless-vnc-container/releases/new](https://github.com/ConSol/docker-headless-vnc-container/releases/new)
+* Write a blog post for [labs.consol.de](https://labs.consol.de/)