Re-instantiate GithubApiClient regularly

Our application typically crashes after some time (>1 day) when running
in production, similarly to what we experienced with the ApolloClient
some time ago. We hope that re-instantiating the client will solvee
this issue. If not, we will have to do some form of try-catch within
the coroutines, for instance resulting in a reboot.

src/main/kotlin/no/digipost/github/monitoring/Main.kt

@@ -72,15 +72,15 @@ suspend fun main(): Unit = coroutineScope {
         .register(prometheusMeterRegistry)
 
     val apolloClientFactory = cachedApolloClientFactory(githubToken)
-    val githubApiClient = GithubApiClient(githubToken)
+    val githubApiClientFactory = cachedGithubApiClientFactory(githubToken)
     val slackClient = slackWebhookUrl?.let{ SlackClient(it) }
 
     launch {
         while (isActive) {
             try {
                 withTimeout(TIMOUT_PUBLISH_VULNS) {
                     val timeMillis = measureTimeMillis {
-                        publish(apolloClientFactory.invoke(), githubApiClient, slackClient, severityLimitForNotifications, multiGaugeRepoVulnCount, multiGaugeContainerScan, multiGaugeInfoScore)
+                        publish(apolloClientFactory.invoke(), githubApiClientFactory.invoke(), slackClient, severityLimitForNotifications, multiGaugeRepoVulnCount, multiGaugeContainerScan, multiGaugeInfoScore)
                     }
                     logger.info("Henting av repos med sårbarheter tok ${timeMillis}ms")
                 }
@@ -96,6 +96,28 @@ suspend fun main(): Unit = coroutineScope {
         .startMetricsServer(prometheusMeterRegistry, 9610)
 }
 
+fun cachedGithubApiClientFactory(token: String): () -> GithubApiClient {
+
+    val fakt: (String) -> GithubApiClient = { t: String ->
+        GithubApiClient(t)
+    }
+
+    val age = AtomicLong(System.currentTimeMillis());
+    var client = fakt(token);
+
+    return {
+        if (System.currentTimeMillis() - age.get() < 1000 * 60 * 60 * 10) {
+            println("Cachet GithubApiClient")
+            client
+        } else {
+            println("Lager ny GithubApiClient")
+            client = fakt(token)
+            age.set(System.currentTimeMillis())
+            client
+        }
+    }
+}
+
 fun cachedApolloClientFactory(token: String): () -> ApolloClient {
 
     val fakt: (String) -> ApolloClient = { t: String ->