[Issue] Add input-file argument to varnish:vcl:generate

[m2-assistant]

This issue is automatically created based on existing pull request: #36538: Add input-file argument to varnish:vcl:generate

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This pull request allows us to pass in a path to a custom modified VCL file relative to the Magento root. This way, we can add our own custom VCL to our Git repo and generate it on deploy using a default Magento command.

Manual testing scenarios (*)

1. Install clean Magento
2. Copy the core Varnish file into app/etc
3. Modify the file. For testing purposes, we append # TEST
4. Generate the VCL using the new input-file argument
5. The generated VCL is shown in stdout, and you should see # TEST at the end of the output of the previous command.

Copy & paste;

cp vendor/magento/module-page-cache/etc/varnish6.vcl app/etc/varnish6.vcl
echo "# TEST" >> app/etc/varnish6.vcl
bin/magento varnish:vcl:generate --input-file=app/etc/varnish6.vcl --export-version=6

Questions or comments

If someone could tell me for which scenarios to write a unit test, I'll try to do my best.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-8502 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Lima. Thank you for verifying the issue.
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