Update cheatsheets

docker-save

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# docker save
+
+> Export 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 ...}}`