Templates: open URLs in disposables

[notmuchtohide]

This is part of QubesOS/qubes-issues#6310, aiming to open Gnome Software URLs (project website, donation pages, etc.) in disposables.

This allows the user to check the project website safely before installing apps, while reducing the need for screenshots to recognize the apps in Gnome Software (QubesOS/qubes-issues#10983).

Previously, URLs were opened in offline browsers. However, if Gnome Software had access to the updates proxy (e.g. for Flatpak related actions) it would pass the proxy configurations to the browser and open the URL online.

Service ConditionGroup borrowed from qubes-notification-agent.

[ben-grande]

1. Have you tried app-dispvm.*?
2. If that is unsuitable, please use the term dispvm rather than dvm.

[marmarta]

Have you tried app-dispvm.*?

I'm not sure if this makes sense here, opening all urls in a template in disposables makes I think a lot of sense and is more resilient to other package managers using packagekit or whatnot.

• If that is unsuitable, please use the term dispvm rather than dvm.

agreed on that

[andrewdavidwong]

Suggestion: If you intend for this pull request to resolve the associated issue and would like for it to be linked to the issue automatically, you can put Closes QubesOS/qubes-issues#XXXX in the PR message (where XXXX is the issue number). Closes is one of several special keywords that GitHub will recognize. If and when the PR is merged, GitHub will automatically close the associated issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.71%. Comparing base (a37fac9) to head (e1da340).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #665      +/-   ##
==========================================
+ Coverage   71.31%   71.71%   +0.39%     
==========================================
  Files           3        3              
  Lines         502      502              
==========================================
+ Hits          358      360       +2     
+ Misses        144      142       -2     

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