Update cheatsheets

tldr/linux/dnf-config-manager

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dnf config-manager
+
+> Manage DNF configuration options and repositories on Fedora-based systems.
+> More information: <https://manned.org/dnf-config-manager>.
+
+- Add (and enable) a repository from a URL:
+
+`dnf config-manager --add-repo={{repository_url}}`
+
+- Print current configuration values:
+
+`dnf config-manager --dump`
+
+- Enable a specific repository:
+
+`dnf config-manager --set-enabled {{repository_id}}`
+
+- Disable specified repositories:
+
+`dnf config-manager --set-disabled {{repository_id1 repository_id2 ...}}`
+
+- Set a configuration option for a repository:
+
+`dnf config-manager --setopt={{option}}={{value}}`
+
+- Display help:
+
+`dnf config-manager --help-cmd`