ci(flatpak): retry flatpak user install

[ReenigneArcher]

Description

Adds a retry mechanism for installing flatpak dependencies.

Screenshot

Issues Fixed or Closed

• Resolves build: Flatpak randomly fails to install deps (x86_64 only) #139

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.73%. Comparing base (13f107f) to head (7c5608b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   51.96%   52.73%   +0.76%     
==========================================
  Files          40       40              
  Lines       13142    13142              
==========================================
+ Hits         6829     6930     +101     
+ Misses       6313     6212     -101     

Flag	Coverage Δ
aarch64-apple-darwin	51.82% <ø> (+0.76%)	⬆️
aarch64-unknown-linux-gnu	51.80% <ø> (+0.76%)	⬆️
aarch64-unknown-linux-musl	52.36% <ø> (+0.77%)	⬆️
x86_64-apple-darwin	51.82% <ø> (+0.76%)	⬆️
x86_64-pc-windows-msvc	52.70% <ø> (+0.76%)	⬆️
x86_64-unknown-linux-gnu	51.80% <ø> (+0.77%)	⬆️
x86_64-unknown-linux-musl	52.35% <ø> (+0.77%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 6 files with indirect coverage changes

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud