Add AppImage support

[hluk]

AppImage is build and the app starts even on Fedora 43.

What Does Not Work

Cannot Start Clients

Client processes and clipboard monitor cannot be started.

> ./CopyQ-x86_64.AppImage --session test6 show
ERROR: Cannot connect to server! Start CopyQ server first.

Strangely, processes started from the app work if another session (not AppImage) of the app is running, otherwise there are errors like:

Note: Command “copyq: collectScriptOverrides()”
Note:    Exit code: 1
Note:    1. copyq: collectScriptOverrides()
Note: Command “copyq: onTabSelected()”
Note:    Exit code: 1
Note:    1. copyq: onTabSelected()
Note: Command “copyq onStart”
Note:    Exit code: 1
Note:    1. copyq onStart
Note: Command “copyq: onItemsLoaded()”
Note:    Exit code: 1
Note:    1. copyq: onItemsLoaded()
Note: Command “copyq --clipboard-…s monitorClipboard”
Note:    Exit code: 1
Note:    1. copyq --clipboard-access monitorClipboard

> ./CopyQ-x86_64.AppImage --session test6 info exe
/tmp/.mount_CopyQ-LkPoPK/usr/bin/copyq

Maybe something wrong with using the app session in processes.

Clipboard Monitoring

This is probably related to the above.

Clipboard monitoring does not work on newer KDE/Plasma. Not sure why, the required "libkf6guiaddons" + devel package should be installed.

It seems that the app should notice the clipboard. Here is the debug log when starting the app with WAYLAND_DEBUG=1 and after copying a text with wl-copy test:

[2937367.929] {Default Queue} ext_data_control_device_v1#42.data_offer(new id ext_data_control_offer_v1#4278190082)
[2937367.949] {Default Queue} ext_data_control_offer_v1#4278190082.offer("text/plain")
[2937367.958] {Default Queue} ext_data_control_offer_v1#4278190082.offer("text/plain;charset=utf-8")
[2937367.963] {Default Queue} ext_data_control_offer_v1#4278190082.offer("TEXT")
[2937367.968] {Default Queue} ext_data_control_offer_v1#4278190082.offer("STRING")
[2937367.973] {Default Queue} ext_data_control_offer_v1#4278190082.offer("UTF8_STRING")
[2937367.978] {Default Queue} ext_data_control_device_v1#42.selection(ext_data_control_offer_v1#4278190082)
[2937367.985] {Default Queue}  -> ext_data_control_offer_v1#4278190080.destroy()
[2937555.532] {Default Queue} ext_data_control_device_v1#42.data_offer(new id ext_data_control_offer_v1#4278190080)
[2937555.552] {Default Queue} ext_data_control_offer_v1#4278190080.offer("application/x-copyq-owner")
[2937555.560] {Default Queue} ext_data_control_offer_v1#4278190080.offer("text/plain")
[2937555.563] {Default Queue} ext_data_control_offer_v1#4278190080.offer("text/plain;charset=utf-8")
[2937555.568] {Default Queue} ext_data_control_device_v1#42.primary_selection(ext_data_control_offer_v1#4278190080)
[2937555.572] {Default Queue}  -> ext_data_control_offer_v1#4278190081.destroy()
[2937562.405] {Default Queue} ext_data_control_device_v1#42.data_offer(new id ext_data_control_offer_v1#4278190081)
[2937562.413] {Default Queue} ext_data_control_offer_v1#4278190081.offer("application/x-copyq-owner")
[2937562.417] {Default Queue} ext_data_control_offer_v1#4278190081.offer("text/plain")
[2937562.421] {Default Queue} ext_data_control_offer_v1#4278190081.offer("text/plain;charset=utf-8")
[2937562.426] {Default Queue} ext_data_control_device_v1#42.primary_selection(ext_data_control_offer_v1#4278190081)
[2937562.432] {Default Queue}  -> ext_data_control_offer_v1#4278190080.destroy()

Stylesheets, Themes and Translations

The files are included in the AppImage, but cannot be found by the app.

Are the files mounted somewhere for the AppImage?

Network Requests

I think EXTRA_QT_MODULES are missing some Qt plugins.

> ./CopyQ-x86_64.AppImage --session test6 --start-server "r = networkGet('https://www.example.com'); print(r.status); exit()"
Warning: [qt.tlsbackend.ossl] Failed to load libssl/libcrypto.
Warning: [qt.network.ssl] The backend "cert-only" does not support QSslKey
Warning: [qt.network.ssl] Active TLS backend does not support key creation
...
Warning: [qt.network.ssl] The backend "cert-only" does not support QSslSocket
Warning: [qt.network.ssl] The backend named "cert-only" does not support TLS
Warning: [qt.network.ssl] QSslSocket::connectToHostEncrypted: TLS initialization failed
undefined
Terminating server.

[hluk]

@robertstrom Feel free to test the AppImage. It is available at: https://github.com/hluk/CopyQ/actions/runs/19513290889?pr=3323#artifacts

See the description above for the list of things that are not working. Not sure if it can be fixed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.88%. Comparing base (1f05fee) to head (a1d7f38).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3323      +/-   ##
==========================================
- Coverage   79.89%   79.88%   -0.01%     
==========================================
  Files         231      231              
  Lines       28458    28458              
==========================================
- Hits        22736    22735       -1     
- Misses       5722     5723       +1     

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