set image tags to stable version

.env

@@ -1,6 +1,6 @@
 COMPOSE_PROJECT_NAME=kitodo_production_ocrd
 
-CONTROLLER_IMAGE=bertsky/ocrd_controller:latest
+CONTROLLER_IMAGE=bertsky/ocrd_controller:ocrd-stable-20220706
 CONTROLLER_HOST=ocrd-controller
 CONTROLLER_ENV_UID=1001
 CONTROLLER_ENV_GID=1001
@@ -12,14 +12,14 @@ CONTROLLER_MODELS=${PWD}/ocrd/controller/models
 CONTROLLER_CONFIG=${PWD}/ocrd/controller/config
 CONTROLLER_WORKERS=1
 
-MONITOR_IMAGE=bertsky/ocrd_monitor:latest
+MONITOR_IMAGE=markusweigelt/ocrd_monitor:ocrd-stable-20220706
 MONITOR_HOST=ocrd-monitor
 MONITOR_PORT_WEB=5000
 MONITOR_PORT_GTK=8085
 MONITOR_PORT_LOG=8088
 MONITOR_DATA=${PWD}/kitodo/data/metadata
 
-MANAGER_IMAGE=markusweigelt/ocrd_manager:latest
+MANAGER_IMAGE=markusweigelt/ocrd_manager:ocrd-stable-20220706
 MANAGER_HOST=ocrd-manager
 MANAGER_ENV_UID=1001
 MANAGER_ENV_GID=1001
@@ -35,7 +35,7 @@ BUILDER_GIT_SOURCE_URL=https://github.com/markusweigelt/kitodo-production/
 BUILDER_BUILD_RESOURCES=${PWD}/_modules/kitodo-production-docker/kitodo/build-resources
 
 # Application Kitodo.Production
-APP_IMAGE=markusweigelt/kitodo-production:latest
+APP_IMAGE=markusweigelt/kitodo-production:ocrd-stable-20220706
 APP_BUILD_CONTEXT=${PWD}/_modules/kitodo-production-docker/kitodo/
 APP_BUILD_RESOURCES=./build-resources
 APP_DATA=${PWD}/kitodo/data