fix: clone shorebird repo instead of downloading archive

The shorebird CLI requires the installation directory to be a clone of
the git repository.

See: https://github.com/shorebirdtech/shorebird/blob/v0.21.1/third_party/flutter/bin/internal/shared.sh#L210

bin/download

@@ -10,13 +10,5 @@ source "${plugin_dir}/lib/utils.bash"
 
 mkdir -p "$ASDF_DOWNLOAD_PATH"
 
-release_file="$ASDF_DOWNLOAD_PATH/$TOOL_NAME-$ASDF_INSTALL_VERSION.tar.gz"
-
-# Download tar.gz file to the download directory
-download_release "$ASDF_INSTALL_VERSION" "$release_file"
-
-#  Extract contents of tar.gz file into the download directory
-tar -xzf "$release_file" -C "$ASDF_DOWNLOAD_PATH" --strip-components=1 || fail "Could not extract $release_file"
-
-# Remove the tar.gz file since we don't need to keep it
-rm "$release_file"
+# Clone repository to the download directory
+download_release "$ASDF_INSTALL_VERSION"

lib/utils.bash

@@ -35,14 +35,13 @@ list_all_versions() {
 }
 
 download_release() {
-	local version filename url
+	local version url
 	version="$1"
-	filename="$2"
 
-	url="$GH_REPO/archive/v${version}.tar.gz"
+	url="${GH_REPO}.git"
 
 	echo "* Downloading $TOOL_NAME release $version..."
-	curl "${curl_opts[@]}" -o "$filename" -C - "$url" || fail "Could not download $url"
+	git clone --depth 1 --branch "v$version" "$url" "$ASDF_DOWNLOAD_PATH"
 }
 
 install_version() {
@@ -56,6 +55,7 @@ install_version() {
 
 	(
 		mkdir -p "$install_path"
+		cp -r "$ASDF_DOWNLOAD_PATH"/.git "$install_path"
 		cp -r "$ASDF_DOWNLOAD_PATH"/* "$install_path"
 
 		local tool_cmd