#4 - Add local build infra along with a setup script

I added postgres, maria, and keycloak as we'll need them later and we might as well add them to the stack now. I added you guys as reviewers as I don't think we need to bother releng guys with simple setup stuff that's copy-paste of other projects.

config/.env.sample

+WGAPI_MYSQL_PASSWORD=
+WGAPI_POSTGRES_DB=ef_wgapi
+WGAPI_POSTGRES_USER=root
+WGAPI_POSTGRES_PASSWORD=
+WGAPI_KEYCLOAK_USER=admin
+WGAPI_KEYCLOAK_PASSWORD=
+CONFIG_SECRET_PATH=/localdev/eclipsefdn-working-groups-api/config/secret.properties
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