feat: Add update-tmp-font-asset composite action for TMP FontAsset character registration

[Copilot]

Implements a reusable composite action that updates TMP FontAsset registered characters via TMP_FontAsset.TryAddCharacters, running Unity directly inside the pre-built ugui-base image (published by build-ugui-base.yml).

actions/update-tmp-font-asset/action.yml (new)

• Inputs: font-asset-paths (newline-separated, workspace-relative), characters, include-font-features (default: false), unity-license
• Outputs: result (true/false), missing-characters
• The ugui-base image (built by .github/workflows/build-ugui-base.yml) already contains the full Unity project at /root/project via COPY . /root/project in its Dockerfile — no checkout of this repository is needed
• Runs docker run directly against ghcr.io/{owner}/ugui-base:latest; owner is auto-derived from github.action_repository
• Copies specified font assets (.asset + .meta) into a temp _TmpFontUpdater/Assets/TmpFontUpdater/ directory and bind-mounts it into the container at /root/project/Assets/TmpFontUpdater
• Writes a params file with base64-encoded characters to avoid shell injection; uses base64 | tr -d '\n' for cross-platform compatibility; bind-mounted into the container
• Unity license XML written to a temp file and bind-mounted :ro (avoids passing large XML as an env var)
• Inside the container: activates license via -manualLicenseFile, invokes FontAssetUpdater.InsertCharacters, copies the result file to a shared bind-mounted output directory, returns the license
• Copies modified assets back to original workspace paths; always cleans up temp dir

src/UGUIBase.Unity/Assets/Editor/FontAssetUpdater.cs (completed)

Completes the existing stub. Reads tmp-font-update-params.txt from the project root, then for each asset:

var copy = ScriptableObject.CreateInstance<TMP_FontAsset>();
EditorUtility.CopySerialized(fontAsset, copy);
var success = copy.TryAddCharacters(characters, out var missing, includeFontFeatures);
EditorUtility.CopySerialized(copy, fontAsset);
EditorUtility.SetDirty(fontAsset);

Writes tmp-font-asset-result.txt (result=true/false, missingCharacters=...) for the action to consume as step outputs.

Example usage

- uses: AndanteTribe/Actions/actions/update-tmp-font-asset@main
  with:
    font-asset-paths: |
      Assets/TextMeshPro/Fonts/NotoSansCJKjp SDF.asset
    characters: "新規追加文字列"
    unity-license: ${{ secrets.UNITY_LICENSE }}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>TMPのFontAssetを更新する（登録文字を上書きする）CIの作成</issue_title>
<issue_description>内部では これ を呼び出すのが趣旨．

引数は

1. 該当FontAsset配列（パス指定）：必須．コンテナ構築時にAssets下にコピー．gameci/builder はdirtyな変更を許容しないので、.gitignoreとかも配置しないといけないかも．
2. 対象追加文字（string型で複数文字指定）：必須．
3. includeFontFeatures ：任意．デフォルトはfalse.

出力は

1. 結果：true or false
2. missingCharacters

注意点として、

1. ライセンス認証周りとか結構きついので、gameci/builder を使うcomposite-actionになる．ライセンスなどの情報を渡していく必要があるので、gameci/builder 関連引数も適宜引数にしなければいけない．ただ、既にuGUI同梱Unityイメージを事前に作る実装を済ませてあるので、このイメージを使ってやれば高速だと思われる
2. TMP_FontAssetは EditorUtility.CopySerialized してから TryAddCharacters して、上書きする方が安全だと思われる。</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes TMPのFontAssetを更新する（登録文字を上書きする）CIの作成 #33

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[kochounoyume]

@copilot

[kochounoyume]

.github/workflows/build-ugui-base.yml で作成したイメージを使うので、ユーザーからの指定は不要。

[Copilot]

Removed the custom-image input. The ugui-base image is now automatically determined from github.action_repository (commit 031d615).

[kochounoyume]

イメージを事前にビルドしてPackagesにpublishしているはずなので、こんなやり方とらないでください。.github/workflows/build-ugui-base.yml を参照してください

[Copilot]

Replaced the manual cp -r with actions/checkout@v4 that checks out AndanteTribe/Actions (same repo and ref as the action itself) into _andantetribe-actions, then uses projectPath: _andantetribe-actions/src/UGUIBase.Unity — mirroring how build-ugui-base.yml uses the project from a workspace checkout (commit 031d615).

[kochounoyume]

@copilot .github/workflows/build-ugui-base.yml や src/UGUIBase.Unity/Dockerfile を把握していないのか？チェックアウトしなくてもイメージ内に含まれていると思うのだが...もしそうでない、私の誤解だというなら指摘してほしいが。.github/workflows/build-ugui-base.yml でpublishされるイメージを使ってほしい

[Copilot]

You're correct — the image DOES have the full project at /root/project via COPY . /root/project in the Dockerfile. The previous approach was wrong: game-ci/unity-builder always mounts the HOST's projectPath into the container and runs Unity against that, so the image's /root/project was never used. That's why the checkout was there.

The fix in commit 2413701 drops both game-ci/unity-builder and the checkout entirely. We now docker run directly against the published ugui-base image, bind-mounting only the font assets and params into the image's existing /root/project structure. License activation, the Unity build method, and license return all happen inside that single container run.