added an parameter to set the source as an parameter

Containerfile.in

@@ -1,4 +1,7 @@
-FROM quay.io/keycloak/keycloak:latest as builder
+#ifndef SOURCE
+#define SOURCE gitea.sebastian-tobie.de/docker/keycloak:latest-orig
+#endif
+FROM SOURCE as builder
 ENV PATH="/opt/keycloak/bin:/usr/bin:/usr/local/bin"
 
 ENV KC_HEALTH_ENABLED=false
@@ -9,7 +12,7 @@ ENV KC_FEATURES=dynamic-scopes,recovery-codes,preview
 ENV KC_DB_URL=postgresql://postgres.services.tobie:5432/keycloak
 RUN kc.sh build
 
-FROM quay.io/keycloak/keycloak:latest
+FROM SOURCE
 ENV PATH="/opt/keycloak/bin:/usr/bin:/usr/local/bin"
 
 COPY --from=builder /opt/keycloak/ /opt/keycloak/