shellcheck errors in test.sh

[jkirk]

We use the Github Action Super-Linter to lint the code base and found some errors in test.sh. You might want to consider fixing it, to make shellcheck happy. 😉 Thx!

2022-03-04 12:54:22 [INFO]   File:[/github/workspace/roles-generic/jnv.unattended-upgrades/tests/test.sh]
2022-03-04 12:54:22 [ERROR]   Found errors in [shellcheck] linter!
2022-03-04 12:54:22 [ERROR]   Error code: 1. Command output:
------

In /github/workspace/roles-generic/jnv.unattended-upgrades/tests/test.sh line 7:
red=''
^-^ SC2034 (warning): red appears unused. Verify use (or export if used externally).


In /github/workspace/roles-generic/jnv.unattended-upgrades/tests/test.sh line 8:
green=''
^---^ SC2034 (warning): green appears unused. Verify use (or export if used externally).


In /github/workspace/roles-generic/jnv.unattended-upgrades/tests/test.sh line 9:
neutral=''
^-----^ SC2034 (warning): neutral appears unused. Verify use (or export if used externally).

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- green appears unused. Verify use ...

[jnv]

Thanks but these are non-issues, those unused variables are there for output coloring purposes. I can make shellcheck to ignore them though.

[jnv]

I am closing this issue since this role has been deprecated. Feel free to suggest alternatives in #98.