Polishing.

Correctly propagate certificate format.

See gh-688

Author: mp911de

spring-vault-core/src/main/java/org/springframework/vault/core/VaultPkiTemplate.java

@@ -181,6 +181,15 @@ private static Map<String, Object> createIssueRequest(VaultCertificateRequest ce
 		if (certificateRequest.isExcludeCommonNameFromSubjectAltNames()) {
 			request.put("exclude_cn_from_sans", true);
 		}
+
+		if (StringUtils.hasText(certificateRequest.getFormat())) {
+			request.put("format", certificateRequest.getFormat());
+		}
+
+		if (StringUtils.hasText(certificateRequest.getPrivateKeyFormat())) {
+			request.put("private_key_format", certificateRequest.getPrivateKeyFormat());
+		}
+
 		return request;
 	}
 

spring-vault-core/src/test/java/org/springframework/vault/core/VaultPkiTemplateIntegrationTests.java

@@ -159,7 +159,9 @@ void issueCertificateShouldCreateCertificate() throws KeyStoreException {
 	void issueCertificateUsingFormat(KeyFixture keyFixture) throws Exception {
 
 		VaultCertificateRequest request = VaultCertificateRequest.builder()
-				.commonName(keyFixture.format.replace('_', '-') + ".hello.example.com").format(keyFixture.format)
+				.commonName(keyFixture.format.replace('_', '-') + ".hello.example.com")
+				.privateKeyFormat(keyFixture.privateKeyFormat)
+				.format(keyFixture.format)
 				.build();
 
 		VaultCertificateResponse certificateResponse = this.pkiOperations