Remove known issue section in Gitea Actions Doc (#27930)

The bug has been fixed for several months in the
`docker/build-push-action`
The fix commit is
[d8823bfaed](docker/build-push-action@d8823bf)
as the Gitea Actions Doc mentioned too.

Author: lng2020

docs/content/usage/actions/comparison.en-us.md

@@ -130,34 +130,3 @@ More details about the `[actions].DEFAULT_ACTIONS_URL` configuration can be foun
 
 Context availability is not checked, so you can use the env context on more places.
 See [Context availability](https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability).
-
-## Known issues
-
-### `docker/build-push-action@v4`
-
-See [act_runner#119](https://gitea.com/gitea/act_runner/issues/119#issuecomment-738294).
-
-`ACTIONS_RUNTIME_TOKEN` is a random string in Gitea Actions, not a JWT.
-But the `docker/build-push-action@v4` tries to parse the token as JWT and doesn't handle the error, so the job fails.
-
-There are two workarounds:
-
-Set the `ACTIONS_RUNTIME_TOKEN` to empty manually, like:
-
-``` yml
-- name: Build and push
-  uses: docker/build-push-action@v4
-  env:
-    ACTIONS_RUNTIME_TOKEN: ''
-  with:
-...
-```
-
-The bug has been fixed in a newer [commit](https://gitea.com/docker/build-push-action/commit/d8823bfaed2a82c6f5d4799a2f8e86173c461aba?style=split&whitespace=show-all#diff-1af9a5bdf96ddff3a2f3427ed520b7005e9564ad), but it has not been released. So you could use the latest version by specifying the branch name, like:
-
-``` yml
-- name: Build and push
-  uses: docker/build-push-action@master
-  with:
-...
-```

docs/content/usage/actions/comparison.zh-cn.md

@@ -132,34 +132,3 @@ Gitea Actions目前不支持此功能。
 
 不检查上下文可用性，因此您可以在更多地方使用env上下文。
 请参阅[上下文可用性](https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability)。
-
-## 已知问题
-
-### `docker/build-push-action@v4`
-
-请参阅[act_runner#119](https://gitea.com/gitea/act_runner/issues/119#issuecomment-738294)。
-
-`ACTIONS_RUNTIME_TOKEN`在Gitea Actions中是一个随机字符串，而不是JWT。
-但是`DOCKER/BUILD-PUSH-ACTION@V4尝试将令牌解析为JWT，并且不处理错误，因此Job失败。
-
-有两种解决方法：
-
-手动将`ACTIONS_RUNTIME_TOKEN`设置为空字符串，例如：
-
-``` yml
-- name: Build and push
-  uses: docker/build-push-action@v4
-  env:
-    ACTIONS_RUNTIME_TOKEN: ''
-  with:
-...
-```
-
-该问题已在较新的[提交](https://gitea.com/docker/build-push-action/commit/d8823bfaed2a82c6f5d4799a2f8e86173c461aba?style=split&whitespace=show-all#diff-1af9a5bdf96ddff3a2f3427ed520b7005e9564ad)中修复，但尚未发布。因此，您可以通过指定分支名称来使用最新版本，例如：
-
-``` yml
-- name: Build and push
-  uses: docker/build-push-action@master
-  with:
-...
-```