Update cheatsheets

tldr/gh-variable

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gh variable
+
+> Manage GitHub Actions and Dependabot variables.
+> More information: <https://cli.github.com/manual/gh_variable>.
+
+- List variables for the current repository:
+
+`gh variable {{[ls|list]}}`
+
+- List variables for a specific organization:
+
+`gh variable {{[ls|list]}} {{[-o|--org]}} {{organization}}`
+
+- Get a variable for the current repository:
+
+`gh variable get {{name}}`
+
+- Set a variable for the current repository (user will be prompted for the value):
+
+`gh variable set {{name}}`
+
+- Set a variable for a deployment environment in the current repository:
+
+`gh variable set {{name}} {{[-e|--env]}} {{environment_name}}`
+
+- Set an organization variable visible to all repositories:
+
+`gh variable set {{name}} {{[-o|--org]}} {{organization}} {{[-v|--visibility]}} all`
+
+- Set multiple variables from a dotenv file:
+
+`gh variable set {{[-f|--env-file]}} {{path/to/file.env}}`
+
+- Delete a variable for the current repository:
+
+`gh variable delete {{name}}`