build: assemble pinned OBS 32.0.4 runtimes for Linux and Windows

Linux builds libobs and an allowlist of official plugins from source in OBS's
relocatable layout. Windows copies the official release byte-for-byte so the
Game Capture hook keeps its signature. Adds a headless Wayland rig for
PipeWire/portal capture tests on machines without a display.

scripts/rig/headless-wayland.sh

@@ -0,0 +1,94 @@
+#!/usr/bin/env bash
+# Run a command inside a disposable headless Wayland desktop for capture tests.
+#
+#   scripts/rig/headless-wayland.sh <command> [args...]
+#
+# Starts a private D-Bus session with PipeWire, WirePlumber, headless Sway and
+# xdg-desktop-portal-wlr (auto-selecting the only output), plus a 60 FPS test
+# pattern standing in for a game. Everything is torn down when the command exits.
+#
+# This rig exercises the PipeWire/portal path on a machine without a display.
+# It does not replace validation on real hardware (Hyprland, X11, Windows).
+set -euo pipefail
+
+if [[ $# -eq 0 ]]; then
+    echo "usage: $0 <command> [args...]" >&2
+    exit 2
+fi
+
+if [[ -z "${CLIPBIN_RIG_INNER:-}" ]]; then
+    exec env CLIPBIN_RIG_INNER=1 dbus-run-session -- "$0" "$@"
+fi
+
+rig_dir="$(mktemp -d "${TMPDIR:-/tmp}/clipbin-rig.XXXXXX")"
+pids=()
+cleanup() {
+    for pid in "${pids[@]}"; do kill "${pid}" 2>/dev/null || true; done
+    wait 2>/dev/null || true
+    # The D-Bus-activated document portal mounts a FUSE filesystem here.
+    fusermount3 -u "${XDG_RUNTIME_DIR}/doc" 2>/dev/null || true
+    rm -rf "${rig_dir}"
+}
+trap cleanup EXIT
+
+export XDG_RUNTIME_DIR="${rig_dir}/runtime"
+export XDG_CONFIG_HOME="${rig_dir}/config"
+export XDG_CURRENT_DESKTOP=sway
+export XDG_SESSION_TYPE=wayland
+mkdir -p "${XDG_RUNTIME_DIR}" "${XDG_CONFIG_HOME}/xdg-desktop-portal-wlr" "${XDG_CONFIG_HOME}/sway"
+chmod 700 "${XDG_RUNTIME_DIR}"
+
+width="${CLIPBIN_RIG_WIDTH:-1920}"
+height="${CLIPBIN_RIG_HEIGHT:-1080}"
+
+cat > "${XDG_CONFIG_HOME}/sway/config" <<EOF
+output HEADLESS-1 resolution ${width}x${height}@60Hz
+default_border none
+EOF
+cat > "${XDG_CONFIG_HOME}/xdg-desktop-portal-wlr/config" <<EOF
+[screencast]
+chooser_type=none
+output_name=HEADLESS-1
+max_fps=60
+EOF
+
+wait_for() {
+    local what="$1" check="$2"
+    for _ in $(seq 100); do
+        if eval "${check}"; then return 0; fi
+        sleep 0.1
+    done
+    echo "rig: ${what} did not start; logs in ${rig_dir}" >&2
+    exit 1
+}
+
+pipewire > "${rig_dir}/pipewire.log" 2>&1 & pids+=($!)
+wait_for pipewire '[[ -S "${XDG_RUNTIME_DIR}/pipewire-0" ]]'
+wireplumber > "${rig_dir}/wireplumber.log" 2>&1 & pids+=($!)
+pipewire-pulse > "${rig_dir}/pipewire-pulse.log" 2>&1 & pids+=($!)
+
+WLR_BACKENDS=headless WLR_LIBINPUT_NO_DEVICES=1 WLR_HEADLESS_OUTPUTS=1 \
+    sway --config "${XDG_CONFIG_HOME}/sway/config" > "${rig_dir}/sway.log" 2>&1 & pids+=($!)
+wait_for sway 'compgen -G "${XDG_RUNTIME_DIR}/wayland-*" > /dev/null'
+WAYLAND_DISPLAY="$(basename "$(compgen -G "${XDG_RUNTIME_DIR}/wayland-*" | grep -v lock | head -1)")"
+export WAYLAND_DISPLAY
+SWAYSOCK="$(compgen -G "${XDG_RUNTIME_DIR}/sway-ipc.*" | head -1)"
+export SWAYSOCK
+
+dbus-update-activation-environment WAYLAND_DISPLAY XDG_CURRENT_DESKTOP XDG_RUNTIME_DIR XDG_CONFIG_HOME SWAYSOCK
+/usr/lib/xdg-desktop-portal-wlr > "${rig_dir}/xdpw.log" 2>&1 & pids+=($!)
+/usr/lib/xdg-desktop-portal -r > "${rig_dir}/xdp.log" 2>&1 & pids+=($!)
+
+# A moving 60 FPS picture with a tone, standing in for a game.
+SDL_VIDEODRIVER=wayland ffplay -loglevel error -fs -window_title clipbin-test-game \
+    -f lavfi "testsrc2=size=${width}x${height}:rate=60,format=yuv420p" \
+    > "${rig_dir}/game.log" 2>&1 & pids+=($!)
+sleep 1
+
+echo "rig: ready (WAYLAND_DISPLAY=${WAYLAND_DISPLAY}, logs in ${rig_dir})" >&2
+status=0
+"$@" || status=$?
+if [[ -n "${CLIPBIN_RIG_KEEP_LOGS:-}" ]]; then
+    cp -r "${rig_dir}" "${CLIPBIN_RIG_KEEP_LOGS}"
+fi
+exit "${status}"