`application.properties` or `protean.properties` support and location

Instead of (or in addition to) META-INF/microprofile-config.properties it would be nice to support one of the 2 names (issue title).

Also, it is possible to configure the file location? META-INF means “from inside the package”, so the configuration cannot be located directly on the file system. This can be an issue if we want to mount it using a config map. Should a specific location (such as $PWD/conf/application.properties) be checked by default?

(don’t do $PWD/application.properties as a config map cannot be mounted in an existing directory (or erase the content))

[gsmet]

I think what’s @cescoffier was suggesting is that we do:

• jar:/application.properties (or jar:/config/applications.properties)
• $PWD/config/application.properties

So that he can mount the $PWD/config directory as a volume.

[cescoffier]

Using $PWD is not recommended as it would prohibit the usage of volume to mount the file