matrix: Integrate with Keycloak

Closes #94 (closed)

    attribute_requirements:
      - attribute: roles
        value: "Staff"

This is new in Synapse 1.31.0 and with the help of the mapper on the keycloak side should restrict logins to the Staff role.

approved this merge request

added 19 commits

• 0e40f223...fd9a09d8 - 18 commits from branch master
• 3e475457 - matrix: Integrate with Keycloak

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enabled an automatic merge when the pipeline for 3e475457 succeeds

mentioned in commit afebcd08

merged