Update cheatsheets

tldr/linux/apptainer-shell

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apptainer shell
+
+> Start an interactive shell within an Apptainer container.
+> See also: `apptainer exec`, `apptainer run`.
+> More information: <https://apptainer.org/docs/user/main/cli/apptainer_shell.html>.
+
+- Start an interactive shell inside a container:
+
+`apptainer shell {{path/to/image.sif}}`
+
+- Start a shell with a bind mount from host to container:
+
+`apptainer shell {{[-B|--bind]}} {{path/to/source}}:{{path/to/destination}} {{path/to/image.sif}}`
+
+- Start a shell with environment variables:
+
+`apptainer shell --env {{variable}}={{value}} {{path/to/image.sif}}`
+
+- Start a shell in fully isolated mode (contained filesystem, PID, IPC, and clean environment):
+
+`apptainer shell {{[-C|--containall]}} {{path/to/image.sif}}`
+
+- Start a shell with a writable temporary filesystem overlay:
+
+`apptainer shell --writable-tmpfs {{path/to/image.sif}}`
+
+- Start a shell with NVIDIA GPU support:
+
+`apptainer shell --nv {{path/to/image.sif}}`
+
+- Start a shell using a specific shell program:
+
+`apptainer shell {{[-s|--shell]}} {{path/to/shell}} {{path/to/image.sif}}`
+
+- Display help:
+
+`apptainer shell {{[-h|--help]}}`