fix(cdn): Fix CDN acceptance tests

Author: Matheus Politano

stackit/internal/services/cdn/cdn_acc_test.go

@@ -42,6 +42,7 @@ var (
 	// Build the full domain name here so we can use it to sign the certificate
 	fullDomainNameHttp = fmt.Sprintf("%s.%s", dnsRecordNameHttp, dnsNameHttp)
 
+	// Pass the full domain to the certificate generation
 	cert, key = makeCertAndKey(testutil.OrganizationId, fullDomainNameHttp)
 )
 
@@ -101,7 +102,7 @@ func configVarsHttpUpdated() config.Variables {
 	return updatedConfig
 }
 
-func makeCertAndKey(organization, domain string) (cert, key []byte) {
+func makeCertAndKey(organization string, domain string) (cert, key []byte) {
 	privateKey, err := rsa.GenerateKey(cryptoRand.Reader, 2048)
 	if err != nil {
 		fmt.Printf("failed to generate key: %s", err.Error())
@@ -113,7 +114,7 @@ func makeCertAndKey(organization, domain string) (cert, key []byte) {
 			Organization: []string{organization},
 			CommonName:   domain, // Required by most modern TLS validations
 		},
-		DNSNames:              []string{domain},
+		DNSNames:              []string{domain}, // Subject Alternative Name (SAN) is strictly required now
 		NotBefore:             time.Now(),
 		NotAfter:              time.Now().Add(time.Hour),
 		KeyUsage:              x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,