docker-save: add page (#4936)

pages/common/docker-save.md

@@ -0,0 +1,20 @@
+# docker save
+
+> Export one or more docker images to archive.
+> More information: <https://docs.docker.com/engine/reference/commandline/save/>.
+
+- Save an image by redirecting `stdout` to a tar archive:
+
+`docker save {{image}}:{{tag}} > {{path/to/file.tar}}`
+
+- Save an image to a tar archive:
+
+`docker save --output {{path/to/file.tar}} {{image}}:{{tag}}`
+
+- Save all tags of the image:
+
+`docker save --output {{path/to/file.tar}} {{image_name}}`
+
+- Cherry-pick particular tags of an image to save:
+
+`docker save --output {{path/to/file.tar}} {{image_name:tag1 image_name:tag2 ...}}`