gh-secret: add page (#5133)

pages/common/gh-secret.md

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+# gh secret
+
+> Manage GitHub secrets from the command line.
+> More information: <https://cli.github.com/manual/gh_secret>.
+
+- List secret keys for the current repository:
+
+`gh secret list`
+
+- List secret keys for a specific organization:
+
+`gh secret list --org {{organization}}`
+
+- List secret keys for a specific repository:
+
+`gh secret list --repo {{owner}}/{{repository}}`
+
+- Set a secret from a file for the current repository:
+
+`gh secret set {{name}} < {{path/to/file}}`
+
+- Set a secret for a specific repository:
+
+`gh secret set {{name}} --body {{value}} --repo {{owner}}/{{repository}}`
+
+- Set an organization secret for specific repositories:
+
+`gh secret set {{name}} --org {{organization}} --repos {{repository1,repository2}}`
+
+- Remove a secret for the current repository:
+
+`gh secret remove {{name}}`
+
+- Remove a secret for a specific organization:
+
+`gh secret remove {{name}} --org {{organization}}`