[BUG] deb-src entries missing from deb822 sources

[nakermann1973]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Commit b301bee change the sources format to deb822. This removed the deb-src entries, resulting in https://github.com/linuxserver/docker-xvfb/tree/ubunturesolute being unable to build

It returns the error:

43.67 E: You must put some 'deb-src' URIs in your sources.list
------
Dockerfile:9
--------------------
   8 |     
   9 | >>> RUN \
  10 | >>>   echo "**** build deps ****" && \
  11 | >>>   apt-get update && \
  12 | >>>   apt-get install -y \
  13 | >>>     devscripts \
  14 | >>>     dpkg-dev && \
  15 | >>>   apt-get build-dep -y \
  16 | >>>     xorg-server 
  17 |     

Expected Behavior

Image should build correctly.

Steps To Reproduce

• Checkout https://github.com/linuxserver/docker-xvfb/tree/ubunturesolute
• docker build .

Environment

OS: Gentoo

Docker creation

N/A

Container logs

N/A

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