Add script to add `sourcearcade` realm to Keycloak
diff --git a/keycloak/init/Dockerfile b/keycloak/init/Dockerfile
new file mode 100644
index 0000000..29f76bc
--- /dev/null
+++ b/keycloak/init/Dockerfile
@@ -0,0 +1,5 @@
+ARG KC_TAG=22.0
+FROM quay.io/keycloak/keycloak:${KC_TAG}
+
+COPY sa-up /opt/keycloak/bin/sa-up.sh
+ENTRYPOINT ["/bin/sh", "/opt/keycloak/bin/sa-up.sh"]