Update cheatsheets

tldr/linux/apptainer-push

@@ -0,0 +1,30 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apptainer push
+
+> Push container images to remote registries.
+> See also: `apptainer-pull`.
+> More information: <https://apptainer.org/docs/user/main/cli/apptainer_push.html>.
+
+- Push a container to the Container Library:
+
+`apptainer push {{path/to/image.sif}} library://{{user/collection/container}}:{{tag}}`
+
+- Push a container to an OCI registry:
+
+`apptainer push {{path/to/image.sif}} oras://{{registry/namespace/image}}:{{tag}}`
+
+- Push an [U]nsigned container (skip signature verification):
+
+`apptainer push {{[-U|--allow-unsigned]}} {{path/to/image.sif}} library://{{user/collection/container}}:{{tag}}`
+
+- Push a container with a [D]escription (library only):
+
+`apptainer push {{[-D|--description]}} "{{description}}" {{path/to/image.sif}} library://{{user/collection/container}}:{{tag}}`
+
+- Display help:
+
+`apptainer push {{[-h|--help]}}`