feat: Add assets to Linux release package

[Fei1Yang]

Add basic assets to Linux release package to fulfill part of Flathub's submission requirements (flathub/flathub#5907)

Summary by Sourcery

Add assets to the Linux release package to comply with Flathub's submission requirements, and update CI workflows to incorporate these assets into the build process.

New Features:

• Add basic assets to the Linux release package, including icons and metadata files, to meet Flathub's submission requirements.

CI:

• Update CircleCI and GitHub Actions workflows to include steps for adding assets to the Linux build.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds necessary assets to the Linux release package to meet Flathub submission requirements. The implementation involves modifying CI configuration files to copy icons and metadata files into the Linux build bundle, and adding new Linux-specific asset files.

Class diagram for new Linux asset files

classDiagram
    class Component {
        +String id
        +String name
        +String summary
        +String metadata_license
        +String project_license
        +List~String~ supports
        +String developer_name
        +String description
        +String content_rating
        +String launchable
        +List~Screenshot~ screenshots
        +List~Release~ releases
    }

    class Screenshot {
        +String type
        +String image
        +String caption
    }

    Component "1" -- "*" Screenshot

    class RuneDesktop {
        +String content
    }

    note for Component "Represents the rune.metainfo.xml file"
    note for RuneDesktop "Represents the rune.desktop file"

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File-Level Changes

Change	Details	Files
Added Linux-specific metadata files for Flathub submission	Created AppStream metadata file with application description and screenshots Added desktop entry file for Linux desktop integration	assets/source/linux/rune.metainfo.xml assets/source/linux/rune.desktop
Updated CI configurations to include assets in Linux build bundle	Added new step to create assets directory in build bundle Added commands to copy Papirus icons to build bundle Added commands to copy Linux-specific assets to build bundle	.circleci/config.yml .github/workflows/build.yml

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[sourcery-ai]

Hey @Fei1Yang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider using variables or shared steps for the asset paths in CI configs to avoid duplication between arm64 and x64 builds
• The releases section in rune.metainfo.xml is empty - consider adding current version information to meet Flathub requirements

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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