UDF container repository

[m-mohr]

Some users mentioned the need for uploading UDFs. The discussion came up to provide specific docker containers, which shall be installed and used at the back-end providers using WPS processes. This idea was based on the results from the EOEP hackatho, which Alexander reported from. See https://github.com/opengeospatial/EOEPHackathon2018/blob/master/Engineering_Report/5-3-Eurac.adoc for more details. Those docker images could be also be provided centrally at the hub.

[m-mohr]

Just to keep track, here's a quote/feedback from D34:

For example, openEO may consider establishing a centralised repository of UDFs. Such a repository would enable users to share their customised workflows and profit from each other. That would be really helpful in allowing us to easily adopt complicated workflows and provide it to our partners via the SEPAL platform.