feat: add health check monitoring to workspace apps (#4114)

coderd/database/queries/workspaceapps.sql

@@ -20,7 +20,19 @@ INSERT INTO
         icon,
         command,
         url,
-        relative_path
+        relative_path,
+        healthcheck_url,
+        healthcheck_interval,
+        healthcheck_threshold,
+        health
     )
 VALUES
-    ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING *;
+    ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) RETURNING *;
+
+-- name: UpdateWorkspaceAppHealthByID :exec
+UPDATE
+	workspace_apps
+SET
+	health = $2
+WHERE
+	id = $1;