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docs: add permission notes to SSH Container Passthrough (#17347)

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* Update with-docker.en-us.md

* Update with-docker.en-us.md

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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docs/content/doc/installation/with-docker.en-us.md
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@ -333,9 +333,16 @@ sudo -u git ssh-keygen -t rsa -b 4096 -C "Gitea Host Key"
In the next step a file named `/app/gitea/gitea` (with executable permissions) needs to be created on the host. This file will issue the SSH forwarding from the host to the container. Add the following contents to `/app/gitea/gitea`:
```bash
#!/bin/sh
ssh -p 2222 -o StrictHostKeyChecking=no git@127.0.0.1 "SSH_ORIGINAL_COMMAND=\"$SSH_ORIGINAL_COMMAND\" $0 $@"
```
Here you should also make sure that you've set the permisson of `/app/gitea/gitea` correctly:
```bash
sudo chmod +x /app/gitea/gitea
```
To make the forwarding work, the SSH port of the container (22) needs to be mapped to the host port 2222 in `docker-compose.yml` . Since this port does not need to be exposed to the outside world, it can be mapped to the `localhost` of the host machine:
```bash