1149 add geojson export to ecocounter open data

[gabrielwol]

What this pull request accomplishes:

• Create a view to format open data locations as geojson in postgres
• Add new task to export the view

Issue(s) this solves:

• Add geojson export to Ecocounter Open Data #1149

What, in particular, needs to reviewed:

What needs to be done by a sysadmin after this PR is merged

E.g.: these tables need to be migrated/created in the production schema.

[chmnata]

does the geojson need a properties field? Can't get the geojson to dispplay on geojson.io

[gabrielwol]

does the geojson need a properties field? Can't get the geojson to dispplay on geojson.io

Weird, it opened fine in QGIS and https://geojson.tools, but looks like some tools require properties where I used attributes. I'll change that.

[radumas]

Can you double check what CKAN would require to display the map on an open data page?

[gabrielwol]

I made the attributes -> properties change and it works in all 4 tools I tried. I created a Jira ticket mentioning we want the map displayed as a preview on the landing page.