Add flatpak build plumbing

- io.github.bemagri.nomines.yml: builds libsigc++/glibmm/cairomm/pangomm/gtkmm
  from tarballs against the GNOME 46 runtime, then the app from the v1.0.0 tag
- Icon: app-id-named PNGs (128/512) for flatpak export, svg kept for native
  installs; desktop file Icon updated
- README/AGENTS.md: flatpak build instructions and version traps
This commit is contained in:
2026-08-01 15:34:28 +01:00
parent 2dbf64a2e8
commit 97565e415d
8 changed files with 146 additions and 3 deletions
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