sbctl: add page (#13275)

pages/linux/sbctl.md

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+# sbctl
+
+> A user-friendly secure boot key manager.
+> Note: not enrolling Microsoft's certificates can brick your system. See <https://github.com/Foxboron/sbctl/wiki/FAQ#option-rom>.
+> More information: <https://github.com/Foxboron/sbctl#usage>.
+
+- Show the current secure boot status:
+
+`sbctl status`
+
+- Create custom secure boot keys (everything is stored in `/usr/share/secureboot`):
+
+`sbctl create-keys`
+
+- Enroll the custom secure boot keys and Microsoft's UEFI vendor certificates:
+
+`sbctl enroll-keys --microsoft`
+
+- Sign an EFI binary with the created key and save the file to the database:
+
+`sbctl sign {{-s|--save}} {{path/to/efi_binary}}`
+
+- Re-sign all the saved files:
+
+`sbctl sign-all`
+
+- Verify that all EFI executables on the EFI system partition have been signed:
+
+`sbctl verify`