fix: index.jsonの代わりにmanifest.jsonでレイヤーパスを取得

ubuntu-latest(Docker 27)のdocker saveではindex.jsonの
manifests[0]が必ずしも画像マニフェストではないため、
Docker レガシー形式のmanifest.jsonからLayersを直接取得する方式に変更。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: massongit

scripts/deploy_hato_bot/update_uv_version/get_uv_version.sh

@@ -6,22 +6,22 @@ docker pull "$image_tag"
 tmp_tar=$(mktemp)
 trap 'rm "$tmp_tar"' EXIT
 docker save "$image_tag" -o "$tmp_tar"
-manifest_digest=$(tar -xOf "$tmp_tar" index.json | jq -r '.manifests[0].digest' | sed 's/sha256://')
+home_uv_path=$HOME/uv
 
-for digest in $(tar -xOf "$tmp_tar" "blobs/sha256/$manifest_digest" | jq -r '.layers[].digest' | sed 's/sha256://'); do
-  uv_path=$(tar -xOf "$tmp_tar" "blobs/sha256/$digest" 2>/dev/null | gunzip 2>/dev/null | tar -tf - 2>/dev/null | grep -E "usr/local/bin/uv$" | head -1)
+for layer in $(tar -xOf "$tmp_tar" manifest.json | jq -r '.[0].Layers[]'); do
+  uv_path=$(tar -xOf "$tmp_tar" "$layer" 2>/dev/null | gunzip 2>/dev/null | tar -tf - 2>/dev/null | grep -E "usr/local/bin/uv$" | head -1)
 
   if [ -z "$uv_path" ]; then
     continue
   fi
 
-  tar -xOf "$tmp_tar" "blobs/sha256/$digest" | gunzip | tar -xOf - "$uv_path" >"$HOME/uv"
-  chmod +x "$HOME/uv"
+  tar -xOf "$tmp_tar" "$layer" | gunzip | tar -xOf - "$uv_path" >"$home_uv_path"
+  trap 'rm "$home_uv_path"' EXIT
+  chmod +x "$home_uv_path"
   break
 done
 
-trap 'rm "$HOME/uv"' EXIT
-uv_version=$("$HOME/uv" --version | sed -e 's/^uv //g')
+uv_version=$("$home_uv_path" --version | sed -e 's/^uv //g')
 sed -i -e "s/required-version = .*/required-version = \"$uv_version\"/g" pyproject.toml
 image_name=ghcr.io/astral-sh/uv
 image_tag=$image_name:$uv_version-python3.14-bookworm-slim