Portable statically linked Linux binary (2.0.1)

[lowlevelmetal]

Summary

• Prebuilt binary: releases can include one that runs on any x86-64 Linux with glibc ≥ 2.31 (Ubuntu 20.04, Debian 11, RHEL 9, Fedora, Arch and later).
• What's linked statically: FFmpeg 9.0.2 with dav1d, Mbed TLS, libva/libdrm, nv-codec-headers and zlib, plus libstdc++/libgcc/libatomic. Only glibc stays dynamic, because the NDI runtime is loaded with dlopen.
• What's included:
  • software decoding of all common codecs, AV1 included;
  • VAAPI hardware decoding, using the system's drivers through a statically linked libva;
  • NVDEC/CUDA hardware decoding, with the NVIDIA libraries loaded at runtime;
  • HTTPS and other network inputs;
  • V4L2 capture.
• What's not included: X11 screen capture and ALSA/PulseAudio input. These need system libraries, so users who want them build from source.
• Build pieces:
  • packaging/build-static-deps.sh builds the libraries from SHA-256-pinned sources.
  • -DNDISTREAMER_STATIC=ON links them in.
  • packaging/package.sh checks the binary only needs glibc, then creates the archive with third-party notices, license texts, and a tarball of the exact third-party sources (LGPLv3 compliance).
• Release workflow (.github/workflows/release.yml): builds the binary in an Ubuntu 20.04 container, runs the test suite against it, smoke-tests it on Ubuntu 20.04, Debian 11, Rocky Linux 9, Fedora and Arch, and attaches it to published releases. On this PR it builds and tests without publishing.
• HTTPS fix: FFmpeg built with Mbed TLS has no default CA store, so ndistreamer now points it at the system CA bundle unless -o ca_file=... is given.
• Version: bumped to 2.0.1.

Testing

• Locally, the static build passes the suite: 86 tests pass, and the 2 that need x264/LAME-encoded clips are skipped because the static FFmpeg has those encoders disabled.
• In the static build:
  • readelf shows only libc, libm and ld-linux are needed;
  • VAAPI decoding works on an AMD GPU;
  • HTTPS streaming works.
• The regular dynamic build still passes 88/88, including the real-NDI ABI and end-to-end tests.

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