Use SUBFOLDER as asset base to allow mounting homer at a different base path.

[ignatz]

To try run e.g.:

$ docker build -t homer --build-arg SUBFOLDER=/bar . && docker run --rm -p 8080:8080 -e SUBFOLDER=/bar homer

before and after. Previously, the base path wasn't set. So when browsing to the lighthttp alias, you'd be instantly be sent back to the root path.

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #578

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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[ignatz]

Note that a downside of this relatively straight forward approach is that users will have to build their own docker package with the build_arg set.