doc: Add example of sign-blob with key in env var (#3152)

Signed-off-by: Paulo Gomes <[email protected]>
sigstore · Aug 1, 2023 · 8f14abe · 8f14abe
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diff --git a/cmd/cosign/cli/signblob.go b/cmd/cosign/cli/signblob.go
@@ -41,6 +41,9 @@ func SignBlob() *cobra.Command {
   # sign a blob with a local key pair file
   cosign sign-blob --key cosign.key <FILE>
 
+  # sign a blob with a key stored in an environment variable
+  cosign sign-blob --key env://[ENV_VAR] <FILE>
+
   # sign a blob with a key pair stored in Azure Key Vault
   cosign sign-blob --key azurekms://[VAULT_NAME][VAULT_URI]/[KEY] <FILE>
 

diff --git a/doc/cosign_sign-blob.md b/doc/cosign_sign-blob.md