Build fails

[ThatOneCalculator]

   Compiling discord-tauri v0.3.0 (/tmp/discord-tauri/src-tauri)
    Finished release [optimized] target(s) in 26.64s
    Bundling discord-tauri_0.3.0_amd64.deb (/tmp/discord-tauri/src-tauri/target/release/bundle/deb/discord-tauri_0.3.0_amd64.deb)
    Bundling discord-tauri_0.3.0_amd64.AppImage (/tmp/discord-tauri/src-tauri/target/release/bundle/appimage/discord-tauri_0.3.0_amd64.AppImage)
       Error failed to bundle project: error running appimage.sh: error running appimage.sh: `failed to run /tmp/discord-tauri/src-tauri/target/release/bundle/appimage/build_appimage.sh`

[sehnryr]

Had the same issue then tried to run appimage.sh directly and found out it was missing the librsvg-2.0 library.

[gtk/stderr] Please check the 'librsvg-2.0.pc' file is present in $PKG_CONFIG_PATH (you may need to install the appropriate -dev/-devel package).
ERROR: Failed to run plugin: gtk (exit code: 1)

Installing that missing library fixed it