Update cheatsheets

tldr/linux/rpmkeys

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rpmkeys
+
+> Tool to import and remove RPM keys for RPM repositories.
+> When adding an RPM repository, you must also import the corresponding RPM key.
+> More information: <https://rpm-software-management.github.io/rpm/man/rpmkeys.8>.
+
+- List all imported RPM keys. Also outputs its Key ID needed for deleting a imported RPM key:
+
+`sudo rpmkeys --list`
+
+- Remove/Delete a previously imported RPM key, given by its 16-Number/Letters Key ID:
+
+`sudo rpmkeys --delete {{5a278d9c-5bbc73cb}}`
+
+- Import an RPM key of repository:
+
+`sudo rpmkeys --import {{path/to/rpm_key}}`