Add support for setting atifact paths directly

[pmengelbert]

Here is an example of a use-case:

Requirements

• We want to build the eraser controller manager image
• We need it to be a drop-in replacement to avoid breaking workflows

The eraser helm chart has the entrypoint hard-coded as /manager. This is technically wrong, but it's a problem upstream that we can't fix. Dalec doesn't have a way to specify the installation path outside of a) /usr/bin or /usr/<subpath(s)>/bin.

Even though it's against standards, to avoid breaking downstream consumers' workflows, we need to allow the entrypoint to exist at /manager. This is obviously unacceptable for a package but is pretty standard practice for a container image.

One proposed solution is adding a step to add symlinks in the final image (after the package has been installed)