test local_batch_job.py with a simple process graph

[JeroenVerstraelen]

EPIC: #806

• test local_batch_job.py with a simple 1+2 process graph, see if output is written correctly to local job directory.
  • add this as a test
  • This has to work inside the docker container for local deployments

[jdries]

configuration for credentials:
https://github.com/Open-EO/openeo-geotrellis-extensions/blob/f0f81fdb504293601b4d4939cc7f1d2c3eb6c1b4/openeo-geotrellis/src/main/scala/org/openeo/geotrellis/CustomizableHttpRangeReaderProvider.scala#L44
Java system property: "http.credentials.file"
File contents:

{
"services.terrascope.be": {
  "username": "username",
  "password": "plain_text_pw"
}
}

services.terrascope.be is the hostname that is used in asset urls for which basic authentication is required.

[EmileSonneveld]

Update:

• Running a docker command will run the process graph in the current directory and output the results in "./out"
  TODO: make input and output configurable. Maybe with a stub python client local 'connection' object? EDIT: Can pass path to process_graph.json now.

• Running docker image required 'sudo'. TODO: possible as local user? Output files should be written with current user permission. Seems to be root at the moment. EDIT: no sudo needed anymore.

• Logs are shown in console while running, and json structured logs are written to out/openeo.log

• Implementation now exists out of Dockerfile, entrypoint.sh and test_run_graph.py. TODO: find a better place to store those files EDIT: Code now here
  openeo_docker_local.zip

[jdries]

Nice, this seems to almost work as intended.
One of the most important todo's for the deadline is documentation.
The basic page for eoepca is here:
https://eoepca.readthedocs.io/projects/processing/en/latest/design/processing-engine/openeo/
But it actually links to:
https://github.com/Open-EO/openeo-geopyspark-driver/blob/master/README.md

Can you update the markdown to explain the current steps for running batch job in docker? (Or put it in a separate one if too much.)