fix: update version to 0.5.0, add support for PEM and PFX formats, and implement certificate conversion functionality

src/lib/keyvault.ts

@@ -47,15 +47,16 @@ export class KeyVaultStore {
     return expiresOn.getTime() - Date.now() <= thresholdMs;
   }
 
-  async importCertificate(name: string, pemBundle: string): Promise<void> {
+  async importCertificate(name: string, cert: string | Buffer, format: 'pem' | 'pfx' = 'pem'): Promise<void> {
     const options: ImportCertificateOptions = {
       policy: {
-        contentType: 'application/x-pem-file',
+        contentType: format === 'pfx' ? 'application/x-pkcs12' : 'application/x-pem-file',
         issuerName: 'Unknown',
         subject: 'CN=unknown',
       },
     };
-    await this.certClient.importCertificate(name, Buffer.from(pemBundle), options);
+    const certBuffer = typeof cert === 'string' ? Buffer.from(cert) : cert;
+    await this.certClient.importCertificate(name, certBuffer, options);
   }
 }