feat: add Nix flake package, AppImage and .deb packaging

- flake: build teleportfling and teleportfling-gui as nixpkgs packages
  (buildGoModule) with a .desktop entry and icon for the GUI
- packaging/appimage.sh: bundle the GUI + runtime libs (recursive ldd)
  into a self-contained AppImage via appimagetool
- packaging/deb.sh: build a .deb for Debian/Ubuntu with both binaries,
  desktop entry, icon and declared runtime dependencies
- README: document all three packaging methods
- .gitignore: ignore dist/

packaging/deb.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# Build a .deb package of TeleportFling for Debian/Ubuntu.
+#
+# The binary is built with cgo; runtime libraries (libturbojpeg, libpipewire,
+# and the GLFW/GL stack for the GUI) are declared as Debian package
+# dependencies so the .deb works on a stock Debian/Ubuntu install. Output:
+#   dist/teleportfling_<version>_amd64.deb
+#
+# Usage:
+#   ./packaging/deb.sh
+set -euo pipefail
+
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+OUT="${HERE}/dist"
+ROOT="${OUT}/deb-root"
+
+VERSION="0.1.0"
+ARCH="amd64"
+PKG_NAME="teleportfling"
+
+echo "Building teleportfling and teleportfling-gui..."
+nix develop --command bash -c "go build -o '${OUT}/teleportfling' ./cmd/teleportfling && go build -o '${OUT}/teleportfling-gui' ./cmd/teleportfling-gui"
+
+echo "Assembling .deb root..."
+rm -rf "${ROOT}"
+mkdir -p "${ROOT}/DEBIAN" \
+  "${ROOT}/usr/bin" \
+  "${ROOT}/usr/share/applications" \
+  "${ROOT}/usr/share/icons/hicolor/512x512/apps"
+
+install -m 0755 "${OUT}/teleportfling" "${ROOT}/usr/bin/teleportfling"
+install -m 0755 "${OUT}/teleportfling-gui" "${ROOT}/usr/bin/teleportfling-gui"
+install -m 0644 "${HERE}/assets/teleportfling.desktop" "${ROOT}/usr/share/applications/teleportfling.desktop"
+install -m 0644 "${HERE}/assets/teleportfling.png" "${ROOT}/usr/share/icons/hicolor/512x512/apps/teleportfling.png"
+
+# Debian package control file.
+cat > "${ROOT}/DEBIAN/control" <<EOF
+Package: ${PKG_NAME}
+Version: ${VERSION}
+Section: video
+Priority: optional
+Architecture: ${ARCH}
+Maintainer: Pete Edley <[email protected]>
+Depends: libjpeg-turbo8 (>= 2.0), libpipewire-0.3-0 (>= 0.3), libgl1, libglx0,
+ libwayland-client0, libwayland-cursor0, libwayland-egl1, libxkbcommon0,
+ libx11-6, libxrandr2, libxi6, libxcursor1, libxinerama1, libxxf86vm1,
+ libxrender1, libxext6, libxfixes3
+Description: Stream a screen and audio to OBS Teleport receivers
+ Standalone Linux sender for the OBS Teleport protocol. Captures a Wayland
+ screen and system audio, encodes video to JPEG, and streams them over TCP
+ so OBS with the obs-teleport plugin can discover and display the stream.
+ .
+ Provides a headless CLI (teleportfling) and a desktop GUI with system tray
+ (teleportfling-gui).
+Homepage: http://homeserver:3050/pedley/TeleportFling
+EOF
+
+echo "Building .deb..."
+nix shell nixpkgs#dpkg --command dpkg-deb --build --root-owner-group "${ROOT}" "${OUT}/${PKG_NAME}_${VERSION}_${ARCH}.deb"
+
+echo "Done: ${OUT}/${PKG_NAME}_${VERSION}_${ARCH}.deb"