Update cheatsheets

linux/lynis

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lynis
+
+> System and security auditing tool.
+> More information: <https://cisofy.com/documentation/lynis/>.
+
+- Check that Lynis is up-to-date:
+
+`sudo lynis update info`
+
+- Run a security audit of the system:
+
+`sudo lynis audit system`
+
+- Run a security audit of a Dockerfile:
+
+`sudo lynis audit dockerfile {{path/to/dockerfile}}`