app is not codesigned or notarized on macOS

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Describe the bug
Launching the application yields this error dialog:

To Reproduce
Steps to reproduce the behavior:

1. Download the app on any macOS after Mojave
2. Launch it

Expected behavior
I see the dialog with "open" in it instead of "macOS cannot verify that this app is free from malware"

Screenshots
(See above.)

Software involved
Please complete the following information:

ProductName:	macOS
ProductVersion:	12.0.1
BuildVersion:	21A559

• Ajour version: 1.3.2

Additional context
I have a developer certificate and I think I could help you get a github action set up to do this at some point, if nobody on your team has one.

This might help: https://github.com/akeru-inc/xcnotary

You can work around this with right-clicking and going to "Open" but users shouldn't be regularly encouraged to use this workaround.

Log Output
N/A, app does not launch