Add release process for GW apps

Signed-off-by: greta <gretadoci@gmail.com>

processes/app_release.md

@@ -0,0 +1,46 @@
+## App release commands
+
+---
+### Below you will find step by step how to do a release for groupware apps
+
+1. Change directory to the app directory and make sure your environment is clean with git status
+
+2. git checkout stablex.x (patch release) or master/main (major/minor release) (this is the branch we want to release)
+
+3. git pull to have the latest changes
+
+4. git log v1.2.3..HEAD --oneline - this shows all the commits from version v1.2.3 (last release) to HEAD (latest unreleased commit)
+
+    4.1 To ignore the "Merge .." commit you do git log v1.2.3..HEAD --oneline | grep -v "Merge "
+
+5. The commits will be shown, and then we can create a change log with the commits that are shown.
+
+6. We change the version on info.xml, package.json and package-lock.json
+
+    6.1 Tip - Expected number of changed files is 4
+
+7. git checkout -b release/x.x.x to create the release branch
+
+8. git add, git commit (add the version as message) and then we can
+
+9. git push origin release/x.x.x and open a new PR against the target branch (stablex.xx or master/main)
+
+10. Once merged, git pull the latest changes
+
+11. git tag vx.x.x
+
+12. git push origin stablex.x --tags (this means we push the commit + tags)
+
+13. We should also push it to the release git push release stablex.x --tags
+
+14. Then we go to the release's repository tags page, e.g. https://github.com/nextcloud-releases/mail/tags
+
+    14.1 On this draft we add the tag we created, add the change log and publish the release
+
+    14.2 Wait a few minutes for the automation to build the app, add the app .tar.gz to the release and push it to the app store
+
+15. Open the app's main repo and close the vx.y.z milestone
+
+16. Create a milestone for the next patch version
+
+17. If the release was for patch version, forward-port the changelog to master/main