Created Testing Edge (markdown)

Testing-Edge.md

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+## Why test
+
+https://github.com/wekan/wekan/issues/2811
+
+## Who should test
+- If you are the person in your company that gets yelled at when something breaks in new version of Wekan
+- If you think xet7 releasing new version of Wekan every day directly to stable production channel is in any way risky
+
+## Testers to ping with new release
+- All those whose issues were fixed
+- @saschafoerster 
+
+## ChangeLog
+
+https://github.com/wekan/wekan/blob/master/CHANGELOG.md
+
+## Backup before testing. And backup daily in production.
+
+Why? Well, Wekan has no undo yet. If you delete Swimlane/List/Card, it's gone.
+That's why it's harder to reach in submenu. It's better to Arhive those,
+and unarchive.
+
+https://github.com/wekan/wekan/wiki/Backup
+
+You could test at other computer than your production.
+
+## Snap
+
+Snap has automatic update, or you can update manually:
+```
+sudo snap refresh
+```
+You see at https://snapcraft.io/wekan what are current versions.
+
+To change to Edge:
+```
+sudo snap refresh wekan --edge --amend
+```
+And back to stable:
+```
+sudo snap refresh wekan --stable --amend
+```
+
+## Docker
+
+docker-compose.yml is at https://github.com/wekan/wekan .
+
+### Latest development version from master branch
+
+Quay:
+``
+image: quay.io/wekan/wekan
+```
+Docker Hub:
+```
+image: wekanteam/wekan
+```
+
+### Example of using release tags
+
+Quay:
+``
+image: quay.io/wekan/wekan:v3.55
+```
+Docker Hub:
+```
+image: wekanteam/wekan:v3.55
+```
+
+## How to change Docker version
+
+1) Backup first
+https://github.com/wekan/wekan/wiki/Backup
+
+```
+docker-compose stop
+docker rm wekan-app
+```
+2) Change version tag. Then:
+```
+docker-compose up -d
+```
+
+## Sandstorm
+
+1) Install local development version of Sandstorm to your laptop from https://sandstorm.io/install
+
+2) Download and install experimental version to your local Sandstorm:
+https://github.com/wekan/wekan/wiki/Sandstorm
+Local sandstorm is at http://local.sandstorm.io:6080/ .
+
+3) Download your production Wekan grain .zip file with down arrow button. Upload to your dev local Sandstorm.
+Try does it work.