🚧 [#390] Add setup to run keycloak for tests

backend/docker-services/keycloak/Readme.md

@@ -0,0 +1,5 @@
+To export the realm settings, run this command in the keycloak container:
+
+```bash
+/opt/keycloak/bin/kc.sh export --file /tmp/realm_export.json --realm openarchiefbeheer-dev
+```

backend/docker-services/keycloak/docker-compose.yaml

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+version: '3.9'
+
+services:
+  keycloak-db:
+    image: postgres:14
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: keycloak
+      POSTGRES_USER: keycloak
+      POSTGRES_PASSWORD: keycloak
+    networks:
+      - keycloak-dev
+
+  keycloak:
+    depends_on:
+      - keycloak-db
+    container_name: keycloak_dev
+    command: start-dev --import-realm
+    environment:
+      KEYCLOAK_ADMIN: admin
+      KEYCLOAK_ADMIN_PASSWORD: admin
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://keycloak-db/keycloak
+      KC_DB_USERNAME: keycloak
+      KC_DB_PASSWORD: keycloak
+      KC_HOSTNAME: localhost
+    image: quay.io/keycloak/keycloak:latest
+    ports:
+      - "28080:8080"
+    restart: unless-stopped
+    volumes:
+      - ./fixtures:/opt/keycloak/data/import
+    networks:
+      - keycloak-dev
+
+networks:
+  keycloak-dev: