fix: Disabled app list stays empty due to missing diffutils on Alpine

[Aakash788]

Fixes #1911

Description:
This PR fixes issue #1911 by installing diffutils in alpine image and made change in the Dockerfile-alpine.template. This ensures that the disabled app list is populated correctly.

Changes:

• Updated Dockerfile-alpine.template to include diffutils in alpine docker image.

Testing:

• Built the Docker image using the modified Dockerfile.
• Verified that the issue with the empty disabled app list is resolved.

Additional Notes:

• This is my first contribution to this project. Please let me know if there are any changes or improvements needed. I personally use nextcloud in my home-server and its awesome

[Aakash788]

i am so sorry actually after committing this i found another good for first issue and i tried to also contribute that but accidentally commit that here please ignore my second commit. first commit is for #1911 and the second commit is for #1708.

[joshtrichards]

Hi @Aakash788 - Thanks! If you can split out that second commit into a separate PR so it could be reviewed separately that would be appreciated (since they're quite different matters). Otherwise it'll block this PR from being reviewed/merged.

If it's easier, feel free to submit new PRs. If you create a new local branch for each fix, you can submit the PR from those dedicated branches. That may make your life easier too. :-)

[Aakash788]

Hi @joshtrichards I've removed the second commit from the current PR. I'll submit it as a separate PR for separate review and thanks for the advice about using dedicated branches for each fix moving forward to keep things organized.

[J0WI]

diff -u can be used for a more consistent output. I'd prefer that rather than adding something new.

#1213 suggests to remove the logic altogether.