merge: Trim padded Actor keys to avoid value too long error (resolves #806) (!913)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/913

Closes #806

Approved-by: dakkar <dakkar@thenautilus.net>
Approved-by: Marie <github@yuugi.dev>

packages/backend/src/core/activitypub/models/ApPersonService.ts

@@ -447,7 +447,7 @@ export class ApPersonService implements OnModuleInit {
 					await transactionalEntityManager.save(new MiUserPublickey({
 						userId: user.id,
 						keyId: person.publicKey.id,
-						keyPem: person.publicKey.publicKeyPem,
+						keyPem: person.publicKey.publicKeyPem.trim(),
 					}));
 				}
 			});