Make keycloak realm configurable

.env

 VUE_APP_API_URL="http://localhost:8080"
 VUE_APP_KEYCLOAK_ENABLE="false"
+VUE_APP_KEYCLOAK_REALM="HistHub"
 VUE_APP_KEYCLOAK_URL="https://sso.histhub.ch/auth"
 VUE_APP_TEST_USER="test"
 # please use a valid provider. Otherwise the matching won't work

src/main.ts

@@ -23,7 +23,7 @@ Vue.use(VueKeycloakJs, {
   config: {
     url: process.env.VUE_APP_KEYCLOAK_URL,
     clientId: 'metagrid-frontend',
-    realm: 'histHub'
+    realm: process.env.VUE_APP_KEYCLOAK_REALM
   },
   onReady: () => {
     new Vue({