Update cheatsheets

tldr/doppler-secrets

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doppler secrets
+
+> Manage your Doppler project's secrets.
+> More information: <https://docs.doppler.com/docs/accessing-secrets>.
+
+- Get all secrets:
+
+`doppler secrets`
+
+- Get value(s) of one or more secrets:
+
+`doppler secrets get {{secrets}}`
+
+- Upload a secrets file:
+
+`doppler secrets upload {{path/to/file.env}}`
+
+- Delete value(s) of one or more secrets:
+
+`doppler secrets delete {{secrets}}`
+
+- Download secrets as `.env`:
+
+`doppler secrets download --format=env --no-file > {{path/to/.env}}`