add release changelog in release-app and in the app ui

[louis030195]

definition of done:

• when user updated app (e.g. app got restarted) it shows a dialog with changelog
• at the end of release-app.yml something read all commits since last app release and put it openai prompt and ask "generate a summary ...." (figure out a prompt that would give useful and concise changelog bullet list to user) and then it would update a CHANGELOG.md, the app dialog could just embed this file in the dialog, simple

tips:

• i can give you an openai key, dm me on discord, x, telegram @louis030195
• create a script if you need to in .github/scripts dir
• you can use https://github.com/nektos/act to test github action (but likely dont need, just run the script right?)

/bounty 100