Update cheatsheets

tldr/linux/apptainer

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apptainer
+
+> Manage containers for HPC and scientific computing.
+> Some subcommands such as `build`, `pull`, and `push` have their own usage documentation.
+> More information: <https://apptainer.org/docs/user/main/cli.html>.
+
+- Download a container from Docker Hub:
+
+`apptainer pull {{path/to/image.sif}} docker://{{image}}:{{tag}}`
+
+- Download a container from the Container Library:
+
+`apptainer pull {{path/to/image.sif}} library://{{user/collection/container}}:{{tag}}`
+
+- Build a container from a definition file:
+
+`apptainer build {{path/to/image.sif}} {{path/to/definition.def}}`
+
+- Start an interactive shell inside a container:
+
+`apptainer shell {{path/to/image.sif}}`
+
+- Execute a command inside a container:
+
+`apptainer exec {{path/to/image.sif}} {{command}}`
+
+- Run the default runscript of a container:
+
+`apptainer run {{path/to/image.sif}}`
+
+- Inspect a container's metadata:
+
+`apptainer inspect {{path/to/image.sif}}`
+
+- Display help:
+
+`apptainer {{[-h|--help]}}`