system/deployment/2_Image_Building.md

@@ -25,6 +25,9 @@ docker image ls
 docker image rm exampleimageid1 exampleimageid2 exampleimageid3 […]
 # e. g. with IMAGE_IDs:
 docker image rm ba53dde63be9 9a9381a088dd b5040966bef3 cc2f61dbdae0 […]
+# prune docker build cache
+docker builder prune
+docker buildx prune
 ```
 
 Create a backup of the old/existing reseed directory (to allow going back to the old state if necessary):