#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
Bump Spring Boot to 3.0.0-RC2.
See https://github.com/spring-projects/spring-boot/releases/tag/v3.0.0-RC2 for more.
#### Does this PR introduce a user-facing change?
```release-note
升级 Spring Boot 至 3.0.0-RC2
```
#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
Please refer to <https://github.com/jasync-sql/jasync-sql/releases/tag/2.1.7>.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind feature
/area core
/milestone 2.0
#### What this PR does / why we need it:
Add MySQL script to support running Halo with MySQL database due to https://github.com/jasync-sql/jasync-sql/issues/311 has been resolved.
#### Which issue(s) this PR fixes:
Fixes https://github.com/halo-dev/halo/issues/2464
#### Special notes for reviewers
Steps to test:
1. Start up MySQL. e.g.:
```yaml
version: '3.1'
services:
db:
image: mysql
# NOTE: use of "mysql_native_password" is not recommended: https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password
# (this is just an example, not intended to be a production configuration)
command: --default-authentication-plugin=mysql_native_password
restart: always
environment:
MYSQL_ROOT_PASSWORD: openmysql
ports:
- 3306:3306
adminer:
image: adminer
restart: always
ports:
- 8080:8080
```
```bash
docker-compose -f mysql.yaml up
```
2. Start Halo with `mysql` profile. e.g.:
```bash
./gradlew bootRun --args="--spring.profiles.active=mysql"
```
3. Validate the functionality of Halo
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
将 spring boot 的版本从 3.0.0-M5 降级到 3.0.0-M5 以解决 swragger 无法使用的问题
#### Which issue(s) this PR fixes:
Fixes #
#### Special notes for your reviewer:
/cc @halo-dev/sig-halo
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
将原来系统默认的系统配置 system 改名为 system-default, 并使用名为 system 的 ConfigMap 来存储用户自定义的系统配置。系统最终配置为用户自定义系统配置 Merge Patch 系统默认配置的结果。
see also #2304
#### Which issue(s) this PR fixes:
Fixes#2304
#### Special notes for your reviewer:
/cc @halo-dev/sig-halo
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind feature
/milestone 2.0
/area core
#### What this PR does / why we need it:
提供当前使用主题（预览或激活）的 configMap 变量和部分系统设置等变量。
提供了以下变量：
- `${theme}` 当前主题的信息，theme.yaml
- `${theme.config}` 获取当前主题的设置项
- ~`${siteSetting}`~ `${site}` 提供必要系统变量
#### Which issue(s) this PR fixes:
Fixes#2389
#### Special notes for your reviewer:
how to test it?
再任意主题模板上使用表达式获取例如：`${theme}`,`${theme.config.sns?.email}`
/cc @halo-dev/sig-halo
#### Does this PR introduce a user-facing change?
```release-note
None
```
<!-- Thanks for sending a pull request! Here are some tips for you:
1. 如果这是你的第一次，请阅读我们的贡献指南：<https://github.com/halo-dev/halo/blob/master/CONTRIBUTING.md>。
1. If this is your first time, please read our contributor guidelines: <https://github.com/halo-dev/halo/blob/master/CONTRIBUTING.md>.
2. 请根据你解决问题的类型为 Pull Request 添加合适的标签。
2. Please label this pull request according to what type of issue you are addressing, especially if this is a release targeted pull request.
3. 请确保你已经添加并运行了适当的测试。
3. Ensure you have added or ran the appropriate tests for your PR.
-->
#### What type of PR is this?
/kind feature
/milestone 2.0
/area core
<!--
添加其中一个类别：
Add one of the following kinds:
/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind improvement
适当添加其中一个或多个类别（可选）：
Optionally add one or more of the following kinds if applicable:
/kind api-change
/kind deprecation
/kind failing-test
/kind flake
/kind regression
-->
#### What this PR does / why we need it:
新增文章模块的基本实现
提供创建文章，更新草稿和发布文章三个 API
#### Which issue(s) this PR fixes:
<!--
PR 合并时自动关闭 issue。
Automatically closes linked issue when PR is merged.
用法：`Fixes #<issue 号>`，或者 `Fixes (粘贴 issue 完整链接)`
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
-->
A part of #2322
#### Special notes for your reviewer:
/cc @halo-dev/sig-halo
#### Does this PR introduce a user-facing change?
<!--
如果当前 Pull Request 的修改不会造成用户侧的任何变更，在 `release-note` 代码块儿中填写 `NONE`。
否则请填写用户侧能够理解的 Release Note。如果当前 Pull Request 包含破坏性更新（Break Change），
Release Note 需要以 `action required` 开头。
If no, just write "NONE" in the release-note block below.
If yes, a release note is required:
Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
-->
```release-note
None
```
#### What type of PR is this?
/kind feature
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
1. Replace JDBC to R2DBC
2. Make our system fully reactive
#### Which issue(s) this PR fixes
Fixes#2308
#### Special notes for your reviewer:
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
#### What this PR does / why we need it:
This PR introduces [openapi4j](https://github.com/openapi4j/openapi4j) to replace JSON schema. See #2294 for more.
#### Which issue(s) this PR fixes:
Fix#2294
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind feature
/kind api-change
/area core
/milestone 2.0
#### What this PR does / why we need it:
Add label and field selector to Extension list API for filtering Extensions.
<img width="322" alt="image" src="https://user-images.githubusercontent.com/16865714/181462887-549162fd-5e8d-4cec-834c-24875ada4789.png">
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind flake
/area core
/milestone 2.0
#### What this PR does / why we need it:
Upgrade Spring Boot to 3.0.0-M4. Please see <https://github.com/spring-projects/spring-boot/releases/tag/v3.0.0-M4>.
#### Does this PR introduce a user-facing change?
```release-note
None
```
* feat: split post content to new table and support content version control
* feat: Improve post version management
* feat: Add post content and version record deletion
* feat: Add isInProcess attribute for post list and detail api
* feat: Add migrate sql script
* fix: Add a sql of allow origin_content to null in posts table
* feat: Assign a value to the source of the post content version record
* Bump versions of dependencies
* Bump spring boot to 2.5.8
Signed-off-by: John Niang <johnniang@fastmail.com>
* Revert dependency of bce sdk
Signed-off-by: John Niang <johnniang@fastmail.com>
* feat: Add date parse methods and test
* feat: Add utility methods of get the specified part of the given date
* refactor: Replace the use of dateutil in hutool
* refactor: Replace the StrUtil of hutool with StringUtils of commons-lang3
* refactor: Replace the use of Tuple in hutool
* refactor: Replace the use of ServltUtil in hutool
* refactor: Replace the use of PageUtil in hutool
* refactor: Replace the use of CollectionUtil in hutool
* refactor: Add QRcode generate method
* refactor: replace all hutool utility and add some utils
* fix: check style of tests
* refactor: add logging
* fix: logging
* fix: set default timezone
* fix: code style
* refactor: rename variable tfaKey to mfaKey
* refactor: Use commons-lang3's RandomStringUtils to replace some methods
* refactor: update javadoc
* refactor: update test
* refactor: reformat code
* feat: Add more test case
* feat: Add source
John Niang
