Add less command to Docker image

[hongquan]

Fixes #283
This PR also enables pretixuser to run any command with sudo. Before that, this user cannot run supervisorctl, cannot view the logs written down by supervisord.

How has this been tested?

Can use less with sudo:

With less, can search with highlight in logs

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Add the less command to the Docker image and grant the pretixuser unrestricted sudo privileges.

Build:

• Add the less command to the Docker image.
• Grant the pretixuser unrestricted sudo privileges to allow executing commands like supervisorctl and viewing logs.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds the less command to the Docker image and grants the pretixuser unrestricted sudo privileges. The addition of less allows for enhanced log searching and viewing capabilities within the Docker container. The sudo privilege escalation for pretixuser addresses the previous inability to execute supervisorctl and access logs written by supervisord.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added the less command to the Docker image.	Installed the less package using apt-get.	Dockerfile
Granted the pretixuser unrestricted sudo privileges.	Modified the /etc/sudoers file to allow pretalxuser to execute any command with sudo without a password.	Dockerfile

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#283	Add less pager to the Docker container.	✅
#283	Enable pretixuser to run any command with sudo.	✅

Possibly linked issues

• Docker container should have less pager to help view long logs #283: The PR addresses the issue by adding the less command to the Dockerfile.

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[sourcery-ai]

We have skipped reviewing this pull request. We don't review packaging changes - Let us know if you'd like us to change this.