build(config): disable DVB, TV tuner, and PCI capture drivers while keeping USB webcams

[azagramac]

📌 Summary of Changes

This PR migrates the GitHub Actions CI/CD build pipeline to run natively inside a Debian 13 (Trixie) container, resolves runner Out-Of-Memory (OOM) crashes during BTF generation, and trims over 200+ unused DVB/TV capture drivers from the kernel configuration.

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🐳 1. GitHub Actions CI/CD Workflow (build-kernel.yml)

• Native Debian 13 Environment: Added container: debian:trixie to both prepare and build-and-release jobs.
• Modern Toolchain & BTF: Installed gcc-14, g++-14, and dwarves (Pahole 1.30+) for native GCC 14 compilation and full eBPF/BTF generation (CONFIG_DEBUG_INFO_BTF=y).
• 10 GB Swap Space Expansion: Dynamically created and mounted a 10 GB swap file (fallocate -l 10G /swapfile) before compilation to expand total virtual memory to 17 GB. This prevents pahole OOM-killer crashes during split-BTF encoding (BTF [M]).
• Container Bootstrap Fixes: Added an initial 🛠️ Prepare container base tools step (git, sudo, curl, tar, xz-utils) before actions/checkout@v7 to fix missing git/sudo binary errors in minimal Debian docker images.
• Debian 13 Compatibility: Removed deprecated libncurses5-dev package. Added kmod build dependency required by dpkg-buildpackage.

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🧹 2. Kernel Configuration (configs/config-6.19.14-debian13)

• DVB & TV Capture Drivers Disabled: Disabled 245 unused configuration options, including:
  • DVB Core & Digital/Analog TV (# CONFIG_DVB_CORE is not set, # CONFIG_MEDIA_DIGITAL_TV_SUPPORT is not set).
  • PCI/PCIe Capture Cards (# CONFIG_MEDIA_PCI_SUPPORT is not set - Conexant, SAA7134, Bt878, Digital Devices).
  • USB TV Tuners & SDR (# CONFIG_DVB_USB is not set, # CONFIG_VIDEO_EM28XX is not set, # CONFIG_VIDEO_CX231XX is not set).
• Webcam Support Preserved: Kept UVC USB Webcam support active (CONFIG_USB_VIDEO_CLASS=m, CONFIG_MEDIA_CAMERA_SUPPORT=y, CONFIG_VIDEO_DEV=m) for Logitech/Elgato webcams and OBS Studio virtual cameras.

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📚 3. Documentation (README.md)

• Workflow Mermaid Diagram: Redesigned the architecture diagram to reflect the actual 3-stage GitHub Actions pipeline (1. Prepare, 2. Build & Release, 3. Telegram Notification) without hardcoded kernel version strings.
• Hardware Trimming Documentation: Documented DVB & PCI capture card removal under the Hardware Trimming & Bloat Elimination section.

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🔍 Verification

• Local Kconfig verified via grep (CONFIG_USB_VIDEO_CLASS=m, # CONFIG_DVB_CORE is not set).
• Syntax and step sequence of .github/workflows/build-kernel.yml validated.
• Git diff reviewed and confirmed clean across all modified files.