Guard against missing ca certificate during builds

src/lib/db.ts

@@ -4,12 +4,16 @@ import pg from 'pg';
 import { PrismaPg } from '@prisma/adapter-pg';
 import { PrismaClient } from '$lib/generated/prisma/client';
 
+const ca_cert = process.env.DO_CA_CERTIFICATE ?? '';
+
 const pool = new pg.Pool({
 	connectionString: process.env.DATABASE_URL,
-	ssl: {
-		rejectUnauthorized: true,
-		ca: fs.readFileSync('/etc/ssl/certs/do-ca-certificate.crt').toString()
-	}
+	ssl: ca_cert
+		? {
+				rejectUnauthorized: true,
+				ca: fs.readFileSync(ca_cert).toString()
+			}
+		: undefined
 });
 
 const adapter = new PrismaPg(pool);