Allow for local file references in requirements when building AppImages #993
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Previously, any attempt to use a local file reference a requirements list would fail on Linux AppImage because the file reference wouldn't be valid inside the Docker container
This PR modifies the build process, transforming the requirements when invoked from within a Docker context, adding a Docker filesystem mount for each individual local file requirement (Fixes #992).
It also modifies the Open command on AppImage under Docker so that open will start a shell session in the docker container. This container will honor the filesystem mounts needed for any app or test requirements. Strictly, this is a separate feature; but it was needed to debug the former bug, and is closely related in the interaction with requirements. (Fixes #991).
PR Checklist: