Update cheatsheets

tldr/linux/secret-tool

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# secret-tool
+
+> Store and retrieve passwords, part of the `libsecret` package.
+> Communicates with Freedesktop secret service implementations such as `gnome-keyring`.
+> More information: <https://gnome.pages.gitlab.gnome.org/libsecret/>.
+
+- Store a secret with an optional label:
+
+`secret-tool store --label={{label}} {{key}} {{value}}`
+
+- Retrieve a secret:
+
+`secret-tool lookup key {{key}}`
+
+- Get more information about a secret:
+
+`secret-tool search key {{key}}`
+
+- Delete a stored secret:
+
+`secret-tool clear key {{key}}`