## Problem
- Manual network configuration using the dracut boot options is not easy
## Solution
- Added new boot option `live.net_config_tui=1` to interactively
configure network settings using the `nmtui` tool.
- Additional features:
- Allow configuring the HTTP proxy
- Display the network configuration summary
- Added network test button which tries connecting to www.suse.com to
check that the network setup is correct.
## Testing
- Tested manually
## Notes
- It turned out that configuring the Wifi network is not possible
because the drivers are missing in the initrd. In theory after adding
the Wifi drivers (and firmware if required) it should be possible to
configure also the Wifi cards and use them for downloading the
self-updates.
## Screenshots
The initial summary screen:
<img width="1280" height="800" alt="agama-net-config-summary-devices"
src="https://github.com/user-attachments/assets/35ab0b0e-6907-4c9b-b60d-b3e2fc04ccde"
/>
After pressing "Edit" button the `nmtui` tool is started
<img width="1280" height="800" alt="agama-net-config-edit"
src="https://github.com/user-attachments/assets/5cbc7a82-8a7e-46b1-8e8e-0a43af2554c9"
/>
Then the user is asked to optionally configure the HTTP proxy:
<img width="1280" height="800" alt="agama-net-config-proxy"
src="https://github.com/user-attachments/assets/bd2fac93-a908-406f-87c9-7016e622b721"
/>
Then the summary dialog is displayed again. After pressing the "Test
connection" button a request to `https://www.suse.com` is sent and the
result is displayed on the screen:
<img width="1280" height="800" alt="agama-net-config-test"
src="https://github.com/user-attachments/assets/ba49d61e-295c-48f7-a421-d8a7241a0974"
/>
When the "Continue" button is pressed in the summary the boot process
continues as usually.
A proof that the configured network proxy is used in the self-update
step later:
<img width="1280" height="800" alt="nmtui7"
src="https://github.com/user-attachments/assets/476e54db-4f4d-480b-964c-b0b0009397af"
/>
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