* Add environment variable token provider.
This adds a new token provider that looks for tokens located at SIGSTORE_ID_TOKEN.
This is an alternative to COSIGN_IDENTITY_TOKEN, which is implemented as
a Viper binding.
ID_TOKEN was used instead of IDENTITY_TOKEN, since this seems to be
consistent with other providers (e.g. ACTIONS_ID_TOKEN_REQUEST_TOKEN).
If this ends up being confusing we can add support for both variants
later if needed.
Signed-off-by: Billy Lynch <billy@chainguard.dev>
* Add envvar provider to providers/all.
Signed-off-by: Billy Lynch <billy@chainguard.dev>
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Signed-off-by: Billy Lynch <billy@chainguard.dev>
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