Continuous deployment to Maven Central using GitHub Actions

[kevin70]

Translated in English:

Continuous deployment to Maven Central using GitHub Actions.

• deploy-snapshot.yml will deploy the main branch code as SNAPSHOT version to the Sonatype Snapshots repository
• deploy-release.yml will deploy tags starting with v* as RELEASE version to the Sonatype repository

After merge this PR, project owner need to add OSSRH username, password, GPG Key, etc. in Settings> Secrets.

• SIGNING_SECRET_KEY_RING_FILE GPG Private Key for jar signature during Maven deployment, and the file should be encoded by Base64.
• GPG_PASSPHRASE GPG Private Key passphrase (if it exists)
• OSSRH_USERNAME the username for sign in OSSRH
• OSSRH_PASSWORD the password of the user for sign in OSSRH

Original version (Chinese):

使用 GitHub Actions 自动发布 Maven 版本。

• deploy-snapshot.yml 推送至 main 分布的内容自动发布 SNAPSHOT 版本至 Sonatype 快照仓库中；
• deploy-release.yml 推送的 tags 前缀以 v* 开关的标签将自动发布 RELEASE 版本至 Sonatype 仓库中。

合并代码后，需要在项目的 Settings > Secrets 中增加 OSSRH用户密码、GPG Key 相关配置。

• SIGNING_SECRET_KEY_RING_FILE GPG Private Key 用于 Maven 发布签名的密钥，文件采用 BASE64 编码保存；
• GPG_PASSPHRASE GPG 密钥的密码（如果没有密码可以忽略）；
• OSSRH_USERNAME OSSRH 的登录用户名；
• OSSRH_PASSWORD OSSRH 的登录密码。

[mp911de]

Can you please use english commit messages as english is the predominant language here?

[mirromutth]

Great thanks for you contribution. I have translated the PR title and content into English. Later I will translate commit messages into English and submit a new PR. Of course, the commit author (i.g. @kevin70 ) will be kept as it is.

Chinese version:

感謝您的代碼貢獻。我已將標題和内容翻譯爲英語。之後我會將Commit信息一并翻譯為英語並提交一個新的PR。當然，Commit的作者信息（也就是您）將會原封不動的保留。

[kevin70]

Please refer to #205.