Remove container names for podman

The way we currently setup podman containers in the Makefile, we don't
get any kind of namespacing for containers. To avoid clashes with
other names, we avoid giving the containers names at all. Most user
operations are can still refer to the stable name of the pod.

Makefile

@@ -5,8 +5,6 @@ COMPOSER_VERSION = 2.1.5
 COMPOSER_CHECKSUM = be95557cc36eeb82da0f4340a469bad56b57f742d2891892dcb2f8b0179790ec
 IMAGE_TAG ?= $(shell git describe --tags --match 'v*' --dirty)
 IMAGE_PREFIX ?= docker.io/grocy
-BACKEND_CONTAINER_NAME ?= grocy-backend
-FRONTEND_CONTAINER_NAME ?= grocy-frontend
 POD_NAME ?= grocy-pod
 APP_DB_VOLUME_NAME ?= grocy-app-db
 PUBLISH_AT ?= 127.0.0.1:8080
@@ -21,7 +19,6 @@ create: pod
         --add-host frontend:127.0.0.1 \
         --add-host backend:127.0.0.1 \
         --env-file grocy.env \
-        --name "${BACKEND_CONTAINER_NAME}" \
         --pod "${POD_NAME}" \
         --read-only \
         --volume /var/log/php8 \
@@ -31,7 +28,6 @@ create: pod
         --add-host grocy:127.0.0.1 \
         --add-host frontend:127.0.0.1 \
         --add-host backend:127.0.0.1 \
-        --name "${FRONTEND_CONTAINER_NAME}" \
         --pod "${POD_NAME}" \
         --read-only \
         --tmpfs /tmp \