Add GitHub Actions workflow to build dvgrab for CachyOS from PKGBUILD

[Copilot]

Adds CI support for building a CachyOS/Arch Linux package from the repository source, producing a .pkg.tar.zst artifact via makepkg.

New files

• PKGBUILD — Arch-compatible package script targeting dvgrab 3.5.2:

  • Runtime deps: libraw1394, libavc1394, libiec61883
  • Optional deps: libdv, libjpeg-turbo
  • Verified SHA256 checksum for the upstream v3.5.2 tarball
  • Autotools build (./bootstrap && ./configure --prefix=/usr && make)

• .github/workflows/build-cachyos.yml — Runs inside cachyos/cachyos:latest container on every push/PR to master:

  1. Installs deps via pacman
  2. Creates a source tarball from the current checkout (builds working-branch code, not just the tagged release)
  3. Rewrites the PKGBUILD checksum to match the locally-generated tarball
  4. Runs makepkg as a non-root builduser
  5. Uploads *.pkg.tar.zst as the dvgrab-cachyos-package artifact

Job permissions are scoped to contents: read.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gitlab.archlinux.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[NixPlayer]

This is not needed. There is already an official dvgrab package on the extra/ repository on Arch Linux (which is what you would target anyway instead of CachyOS since it's upstream). When a new tagged release is published, i will contact the maintainer of said package to update it.

[ddennedy]

In case you are curious of the result (I was 🙂) https://github.com/ddennedy/dvgrab/actions/runs/23456326371?pr=24