OGC Test-Suite with public web services (WPS, WMS, ...)

OGC could provide a test-suite with public available OWS web services (WPS, WMS, ...) which can be used for OWS client tests (OWSLib, Birdy, Phoenix, ...):
* services could be provides as (docker) containers.
* could be hosted in the cloud.
* should be reliable.
* available for common protocols (WPS, WMS, WFS, WCS, ...) and versions (wps 1.0.0, wps 2.0.0).
* Services/Dockerfiles are versioned (public Git repo).

To make the service response more predictable the service URL should also have the version number of the service/container version, something like this:

http://ogc-testsuite.demo.org/wps/1.0.0/simple/v0.3.5

The issue names no repository files, tests, or entry points. Start by defining the required OGC service protocols and versions from the proposal, then determine how versioned Dockerfiles, hosting, reliability, and stable URLs would be organized. Done means an agreed, versioned set of reliable public services is available for OWS client tests.

Written by the indexing model from the issue text.