Script to store secrets to keyring

[enggnr]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) This PR allows importing sensitive environment variables into envchain

Other information: Fixes #23. This replaces #50.

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### Failed to summarize * home/.chezmoiscripts/universal/run_onchange_after_05-envchain-import-secrets.tmpl (nothing obtained from openai)

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