add mdbook package (#71)

mdbook/build.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd "$DIR"
+
+VERSION="0.5.2"
+INSTALL_DIR="$DIR/mdbook/bin"
+VERSION_FILE="$INSTALL_DIR/.version"
+
+# Skip if already at correct version
+if [ -f "$VERSION_FILE" ] && [ "$(cat "$VERSION_FILE")" = "$VERSION" ]; then
+  echo "mdbook $VERSION already present, skipping."
+  exit 0
+fi
+
+OS="$(uname -s)"
+ARCH="$(uname -m)"
+
+case "${OS}-${ARCH}" in
+  Linux-x86_64)   TARGET="x86_64-unknown-linux-musl" ;;
+  Linux-aarch64)  TARGET="aarch64-unknown-linux-musl" ;;
+  Darwin-arm64)   TARGET="aarch64-apple-darwin" ;;
+  *)
+    echo "Unsupported platform: ${OS}-${ARCH}" >&2
+    exit 1
+    ;;
+esac
+
+FILENAME="mdbook-v${VERSION}-${TARGET}.tar.gz"
+URL="https://github.com/rust-lang/mdBook/releases/download/v${VERSION}/${FILENAME}"
+
+echo "Downloading $FILENAME ..."
+curl -fSL -o "$FILENAME" "$URL"
+
+echo "Extracting ..."
+mkdir -p "$INSTALL_DIR"
+tar -xzf "$FILENAME" -C "$INSTALL_DIR" mdbook
+
+chmod +x "$INSTALL_DIR/mdbook"
+
+rm -f "$FILENAME"
+echo "$VERSION" > "$VERSION_FILE"
+
+echo "Installed mdbook to $INSTALL_DIR"
+du -sh "$INSTALL_DIR"