[#1710] Use published images for Keycloak and Cypress
[#1710] Use published images for Keycloak and Cypress

The images for Keycloak and Cypress are now managed independently
in a different repository:
  https://github.com/akvo/akvo-dockerfiles

By using existing published images we avoid repetitve work between
builds.

akvo/akvo-dash,akvo/akvo-dash,akvo/akvo-lumen,akvo/akvo-lumen,akvo/akvo-dash