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Comment apt-get installer in a GitHub Actions workflow?

ayi

<t>In the new GitHub Actions, I am trying to install a package in order to use it in one of the next steps. 
`name: CI 
 
on: [push, pull_request] 
 
jobs: 
translations: 
runs-on: ubuntu-latest 
steps: 
- uses: actions/checkout@v1 
with: 
fetch-depth: 1 
- name: Install xmllint 
run: apt-get install libxml2-utils

...

<br/>
However this fails with<br/>
<br/>
```<br/>
Run apt-get install libxml2-utils<br/>
  apt-get install libxml2-utils<br/>
  shell: /bin/bash -e {0}<br/>
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)<br/>
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?<br/>
##[error]Process completed with exit code 100.<br/>
<br/>
```<br/>
<br/>
What's the best way to do this? Do I need to reach for Docker?</t>

ayi

<t>The docs say: 
 
The Linux and macOS virtual machines both run using passwordless sudo. When you need to execute commands or install tools that require more privileges than the current user, you can use sudo without needing to provide a password. 
 
So simply doing the following should work:

- name: Install xmllint<br/>
  run: sudo apt install -y libxml2-utils<br/>
<br/>
```</t>