chore: resolve Dockerfile lint warnings

[MMilosz]

References

• Related to Github Workflows: Use Hadolint as a part of CI to lint Dockerfile(s) DSpace#11788

Description

This PR applies the recommended fix from Hadolint DL3019 rule:

https://github.com/hadolint/hadolint/wiki/DL3019

Instructions for Reviewers

1. Remove existing DSpace Docker images (either use Docker Desktop, or use CLI commands: docker images, find image ID, do docker rmi <IMAGE_ID>
2. Refer to DSpace documentation on how to build each Docker image locally. Or, make use of Docker Compose:
   $ docker compose -p d10 -f docker/docker-compose.yml build --no-cache
$ docker compose -p d10 -f docker/docker-compose.yml up

Checklist

• My PR is created against the main branch of code (unless it is a backport or is fixing an issue specific to an older branch).
• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes ESLint validation using npm run lint
• My PR doesn't introduce circular dependencies (verified via npm run check-circ-deps)
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.
• My PR aligns with Accessibility guidelines if it makes changes to the user interface.
• My PR uses i18n (internationalization) keys instead of hardcoded English text, to allow for translations.
• My PR includes details on how to test it. I've provided clear instructions to reviewers on how to successfully test this fix or feature.
• If my PR includes new libraries/dependencies (in package.json), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.
• If my PR includes new features or configurations, I've provided basic technical documentation in the PR itself.
• If my PR fixes an issue ticket, I've linked them together.

[tdonohue]

👍 Thanks @MMilosz ! This looks good to me. I also briefly tested both images and they both work the same as before.

[dspace-bot]

Successfully created backport PR for dspace-9_x:

• [Port dspace-9_x] chore: resolve Dockerfile lint warnings #5050

[tdonohue]

NOTE: At this time, this has only been ported to 9.x because older versions used yarn. They would have to be manually backported (if we decide to do so) as the syntax for yarn is slightly different than npm.