feat: add generic release installer

README.md

@@ -155,6 +155,14 @@ Install a built archive:
 ./scripts/install-to-steam.sh dist/Elsword-GE-11-1+dxvk-git.tar.zst
 ```
 
+Generic installer for release archives, including Flatpak Steam users:
+
+```bash
+./scripts/install-compat-tool.sh /path/to/Tool.tar.zst
+./scripts/install-compat-tool.sh --flatpak /path/to/Tool.tar.zst
+./scripts/install-compat-tool.sh --all /path/to/Tool.tar.zst
+```
+
 Target path:
 
 ```text

scripts/install-compat-tool.sh

@@ -0,0 +1,97 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+native_dir_default="${HOME}/.local/share/Steam/compatibilitytools.d"
+flatpak_dir_default="${HOME}/.var/app/com.valvesoftware.Steam/data/Steam/compatibilitytools.d"
+
+usage() {
+  cat <<'EOF'
+Usage:
+  ./scripts/install-compat-tool.sh /path/to/Tool.tar.zst
+  ./scripts/install-compat-tool.sh --native /path/to/Tool.tar.zst
+  ./scripts/install-compat-tool.sh --flatpak /path/to/Tool.tar.zst
+  ./scripts/install-compat-tool.sh --all /path/to/Tool.tar.zst
+
+Options:
+  --native   Install into native Steam only
+  --flatpak  Install into Flatpak Steam only
+  --all      Install into both native Steam and Flatpak Steam
+EOF
+}
+
+mode="auto"
+archive=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --native|--flatpak|--all)
+      mode="${1#--}"
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      archive="$1"
+      shift
+      ;;
+  esac
+done
+
+[[ -n "$archive" ]] || {
+  usage >&2
+  exit 1
+}
+
+[[ -f "$archive" ]] || {
+  printf "Archive not found: %s\n" "$archive" >&2
+  exit 1
+}
+
+mapfile -t archive_entries < <(tar -tf "$archive")
+tool_name="${archive_entries[0]%%/*}"
+[[ -n "$tool_name" ]] || {
+  printf "Could not determine tool name from archive: %s\n" "$archive" >&2
+  exit 1
+}
+
+targets=()
+
+case "$mode" in
+  native)
+    targets+=("$native_dir_default")
+    ;;
+  flatpak)
+    targets+=("$flatpak_dir_default")
+    ;;
+  all)
+    targets+=("$native_dir_default" "$flatpak_dir_default")
+    ;;
+  auto)
+    if [[ -d "${native_dir_default%/}/.." || -d "$native_dir_default" ]]; then
+      targets+=("$native_dir_default")
+    fi
+    if [[ -d "${flatpak_dir_default%/}/.." || -d "$flatpak_dir_default" ]]; then
+      targets+=("$flatpak_dir_default")
+    fi
+    if [[ ${#targets[@]} -eq 0 ]]; then
+      targets+=("$native_dir_default")
+    fi
+    ;;
+  *)
+    printf "Unsupported mode: %s\n" "$mode" >&2
+    exit 1
+    ;;
+esac
+
+for target in "${targets[@]}"; do
+  mkdir -p "$target"
+  rm -rf "$target/$tool_name"
+  tar --zstd -xf "$archive" -C "$target"
+  printf "Installed %s to %s\n" "$tool_name" "$target/$tool_name"
+done
+
+printf "Steam restart required.\n"
+printf "Select '%s' in the game's compatibility settings.\n" "$tool_name"