@github-actions run

```js
await postComment("hello, world");
```

@github-actions run

<details>
<summary>LGTM 👍 </summary>

```js
const res = await fetch("https://lgtm.in/g", {
  redirect: 'manual'
});
const webSiteUrl = res.headers.get('location');
const picUrl = new URL(webSiteUrl);
picUrl.pathname = picUrl.pathname.replace("/i/", "/p/");
postComment(`![LGTM](${picUrl.href})`);
```
</details>

@github-actions run

```js
function exec(cmd) {
  console.log(execSync(cmd).toString());
}

// Config
const gitUserEmail = "github-actions[bot]@users.noreply.github.com";
const gitUserName = "github-actions[bot]";
const prBranchName = "comment-run/npm-update";

const baseBranchName = context.payload.repository.default_branch";
exec(`git config --global user.email "${gitUserEmail}"`);
exec(`git config --global user.name "${gitUserName}"`);
exec(`git fetch --all`);
exec(`git checkout ${baseBranchName}`);
exec(`git checkout -b ${prBranchName}`);

const packageJson = JSON.parse(require('fs').readFileSync('package.json'));
const depStr = Object.keys(packageJson.dependencies || {}).join(' ');
const devDepStr = Object.keys(packageJson.devDependencies || {}).join(' ');
exec(`npm i ${depStr} ${devDepStr}`);

exec("git status");
exec("git add package*json");
exec(`git commit -m "chore(deps): update npm dependencies"`);
exec(`git push -fu origin ${prBranchName}`);

await githubClient.pulls.create({
  base: baseBranchName,
  head: prBranchName,
  owner: context.repo.owner,
  repo: context.repo.repo,
  title: "chore(deps): update npm dependencies",
  body: "update npm dependencies",
});
```

@github-actions run

<details>
<summary>🚀 Merge preview</summary>

```js
// Get pull-req URL like "https://api.github.com/repos/nwtgck/actions-merge-preview/pulls/4"
const pullReqUrl = context.payload.issue.pull_request.url;
const githubUser = context.payload.repository.owner.login;
const res = await fetch(pullReqUrl, {
  headers: [
    ['Authorization', `Basic ${Buffer.from(`${githubUser}:${githubToken}`).toString('base64')}`]
  ]
});
const resJson = await res.json();
const prUserName = resJson.head.user.login;
const baseBranchName = resJson.base.ref;
const branchName = resJson.head.ref;
const fullRepoName = resJson.head.repo.full_name;
const previewBranchName = `actions-merge-preview/${prUserName}-${branchName}`;
execSync(`git config --global user.email "github-actions[bot]@users.noreply.github.com"`);
execSync(`git config --global user.name "github-actions[bot]"`);
// (from: https://stackoverflow.com/a/23987039/2885946)
execSync(`git fetch --all`);
console.log(execSync(`git checkout ${baseBranchName}`).toString());
console.log(execSync(`git checkout -b ${previewBranchName} ${baseBranchName}`).toString());
console.log(execSync(`git pull https://github.com/${fullRepoName}.git ${branchName}`).toString());
// Push preview branch
// NOTE: Force push (should be safe because preview branch always start with "actions-merge-preview/")
execSync(`git push -fu origin ${previewBranchName}`);
const baseRepoFullName = context.payload.repository.full_name;
// Comment body
const commentBody = `🚀 Preview branch:  \n<https://github.com/${baseRepoFullName}/tree/${previewBranchName}>`;
// Comment the deploy URL
await postComment(commentBody);
```
</details>

@github-actions run

<details>
<summary>🌐 SSH debug over Piping Server</summary>

```js
const crypto = require('crypto');
const pathLen = 64;
const aPath = randomString(pathLen);
const bPath = randomString(pathLen);
const commentUserId = context.payload.comment.user.login;
const clientHostPort =  Math.floor(Math.random() * 55536) + 10000;

console.log(execSync(`
chmod 755 "$HOME"
ls -lA /home
authorized_keys_file="$(sshd -T 2>/dev/null | grep -E '^authorizedkeysfile ' | cut -d ' ' -f 2)"
authorized_keys_file="$(cd && realpath -m "$authorized_keys_file")"
sshd_config_dir="$(dirname "$authorized_keys_file")"
(umask 0077 && mkdir "$sshd_config_dir")
echo $authorized_keys_file;

# (from: https://qiita.com/zackey2/items/429c77e5780ba8bc1bf9#authorized_keys%E3%81%AB%E8%A8%AD%E5%AE%9A%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95)
(echo; curl https://github.com/${commentUserId}.keys; echo) >> ~/.ssh/authorized_keys

sudo apt install -y socat;
`).toString());

// Comment new session
const commentBody = `\
## 🌐 New SSH session
Run the command below.

\`\`\`bash
socat TCP-LISTEN:${clientHostPort} 'EXEC:curl -NsS https\\://ppng.io/${bPath}!!EXEC:curl -NsST - https\\://ppng.io/${aPath}'
\`\`\`

Run the command below in another terminal.

\`\`\`bash
ssh -p ${clientHostPort} runner@localhost
\`\`\`

`;
await githubClient.issues.createComment({
  issue_number: context.issue.number,
  owner: context.repo.owner,
  repo: context.repo.repo,
  body: commentBody
});

execSync(`socat 'EXEC:curl -NsS https\\://ppng.io/${aPath}!!EXEC:curl -NsST - https\\://ppng.io/${bPath}' TCP:127.0.0.1:22`);


function randomString(len){
  const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  const randomArr = new Uint32Array(new Uint8Array(crypto.randomBytes(len * 4)).buffer);
  return [...randomArr].map(n => chars.charAt(n % chars.length)).join('');
}
```

## References
* <https://github.com/Cryolite/gha-sandbox/blob/789130f01504a372775be9a2fe4d8df6c4e0ce5c/.github/workflows/ssh.yaml>)
* <https://qiita.com/Cryolite/items/ed8fa237dd8eab54ef2f>

Thanks Cryolite!

</details>

@github-actions run

```sh
#! /bin/sh
pip install numpy
```

```py
#! /usr/bin/python
import numpy as np

print(np.array([1, 2, 3]))
```

@github-actions run

```js
const url = "https://nwtgck.github.io/comment-run-scripts/hello-world-comment.js";
const js = await (await fetch(url)).text();
eval(js);
```