Reserved folder for storing stack specific resource files

[elsony]

Background: #421

If a stack contains supporting resources that are required for the function of the stack, e.g. Dockerfiles in the future, the stack can store those supporting files as part of the devfile registry. However, there is currently no reserved location for storing those files. This means that when tools like odo when doing a component create, it may potentially overwrite user application files on a component create.

For example, if a stack contains a file docker/Dockerfiles under the stack folder in a registry, during odo create, it will clone the stack folder. If the user application already contains the same file, this clone may overwrite the user file. In order to avoid file collision between user application and files provided by the stack, we can resolve it by reserving a folder, e.g. .devfile or .stack, that allows a stack to store the stack supporting files.

The registry will look something like this:

stacks
     |- nodejs
     |       |- .devfiles
     |       |          |- docker
     |       |                  |- Dockerfile
     |       |
     ...

Note: If we have that, we can also consider putting the devfile.yaml under the .devfile by default.

[elsony]

• Specify resource location to be fully qualified
• Change parser to support .devfiles/devfile.yaml, devfile.yaml under project root will be the priority

[elsony]

Community call discussion 3/28:

1. Not needed as part of devfile 2.2
2. Devfile library already loads devfiles from the .devfiles/devfile.yaml.

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