chore: use alpine linux to minimize image size

[Integral-Tech]

Summary by Sourcery

使用 Alpine Linux 基础镜像以减小 Docker 镜像大小。

构建：

• 使用 node:22-alpine 作为基础镜像。
• 使用 alpine:latest 作为 tgs-to-gif 构建镜像。

Original summary in English

Summary by Sourcery

Use alpine linux base image to reduce the docker image size.

Build:

• Use node:22-alpine as base image.
• Use alpine:latest as tgs-to-gif-build image.

[sourcery-ai]

我们已跳过审查此拉取请求。我们不审查打包更改 - 如果您希望我们更改此设置，请联系我们。

Original comment in English

We have skipped reviewing this pull request. We don't review packaging changes - Let us know if you'd like us to change this.

[sourcery-ai]

Here's the translation to Chinese:

审阅者指南 by Sourcery

此 PR 更改了 Dockerfile 中使用的基础镜像，以减小整体镜像大小。node 镜像从 node:22-slim 更改为 node:22-alpine，tgs-to-gif-build 镜像从 debian:bookworm-slim 更改为 alpine:latest。

由于更改看起来简单，未生成任何图表。

文件级更改

更改	详情	文件
使用 alpine Linux 作为基础镜像	将 node 基础镜像从 node:22-slim 更改为 node:22-alpine 将 tgs-to-gif-build 基础镜像从 debian:bookworm-slim 更改为 alpine:latest	Dockerfile

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Original review guide in English

Reviewer's Guide by Sourcery

This PR changes the base images used in the Dockerfile to reduce the overall image size. The node image is changed from node:22-slim to node:22-alpine, and the tgs-to-gif-build image is changed from debian:bookworm-slim to alpine:latest.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Use alpine Linux for base images	Change node base image from node:22-slim to node:22-alpine Change tgs-to-gif-build base image from debian:bookworm-slim to alpine:latest	Dockerfile

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[Integral-Tech]

As gosu, rlottie and rlottie-dev are currently only available in testing repository of Alpine Linux, this pull request cannot proceed now. Using testing repository in Alpine Linux, especially in release branch, is not recommended in production.