chore: add some info logs (#40)

Note: this commit add some information to the user when file are
successfuly downloaded (ie. CRL and cert)

Author: loicsikidi

internal/validate/certificate.go

@@ -136,6 +136,10 @@ func (c *ekchecker) Check(cfg CheckConfig) error {
 				return fmt.Errorf("failed to download CRL from %q: %w", url, err)
 			}
 
+			c.logger.
+				WithField("url", url.String()).
+				Info("CRL downloaded")
+
 			if err := crl.Verify(issuers...); err != nil {
 				return fmt.Errorf("failed to verify CRL: %w", err)
 			}
@@ -239,6 +243,10 @@ func (c *ekchecker) getIssuerCertificates(cert *x509.Certificate) ([]*x509.Certi
 			return nil, fmt.Errorf("failed to download issuer certificate: %w", err)
 		}
 
+		c.logger.
+			WithField("url", url.String()).
+			Info("certificate downloaded")
+
 		hash := sha256.Sum256(cert.Raw)
 		fingerprint := hex.EncodeToString(hash[:])
 		if seen[fingerprint] {