automate mounting files inside /tmp for the wrapper scripts, so phpstorm
can check the php version inside the container.

sometimes it's not possible to directly use `avatar shell`, `avatar
export-env` or `avatar run` to execute containerized cli tools, and
writing a wrapper becomes mandatory.

This commit changes `avatar install` to generate these wrappers for us
in advance, so we can use them to integrate Avatar-CLI into tools like
JetBrains IDEs.

executing project scripts that refer a dockerized interpreter in their
shebang was problematic when using absolute paths (or when the binary
was accessible through the $PATH environment variable).

This patch translates host absolute routes into container absolute
routes when these routes have the project path as prefix.

this commit also provices a fix for a recently discovered bug that
becomes noticeable when oci images have multiple associated remote
registries.

prepare Avatar-CLI to allow extending the PATH environment variable.
This useful when some projects depend on "local" binaries available in
some project directory.

In order to improve configurability at the image name level, we must
introduce an intermediate field (tags) between image name and image tag.

This new intermediate field allows us to introduce other configuration
fields (like runConfig) at the image level.

BREAKING CHANGE: change Avatarfile schema