Switch to cron-based scheduling and update Liquibase configuration

src/main/java/codes/thischwa/jvs/service/UpdateScheduler.java

@@ -19,7 +19,8 @@ public class UpdateScheduler {
   private final GitService gitService;
   private final JavadocService javadocService;
 
-  @Scheduled(fixedRateString = "${jvs.update-interval:PT1H}")
+
+  @Scheduled(cron = "${jvs.cron}")
   public void updateAll() {
     log.info("Starting scheduled update of repositories...");
     List<GitRepository> repos = repository.findAll();

src/main/resources/application.yml

@@ -8,10 +8,8 @@ spring:
     database-platform: org.hibernate.dialect.H2Dialect
     hibernate:
       ddl-auto: none
-  liquibase:
-    change-log: classpath:db/changelog/db.changelog-master.yaml
 
 jvs:
   config-path: ./jvs.yml
   base-dir: ./javadoc-storage
-  update-interval: PT1H
+  cron: 0 0/15 * * * ?