Add cancellation for collection launches

src/routes/api/deployment-collections/[id]/cancel/+server.ts

@@ -0,0 +1,15 @@
+import { json } from '@sveltejs/kit';
+import { cancelCollection } from '$lib/server/fleet/collections.js';
+import { db } from '$lib/server/db/index.js';
+import { kickProvisioning } from '$lib/server/pipeline/worker.js';
+
+export function POST({ params }: { params: { id: string } }) {
+    if (!db().prepare('SELECT 1 FROM server_launch_collections WHERE id=?').get(params.id)) {
+        return json({ error: 'Collection not found.' }, { status: 404 });
+    }
+    if (!cancelCollection(params.id)) {
+        return json({ error: 'This collection has no work that can still be cancelled. Refresh to see its current state.' }, { status: 409 });
+    }
+    void kickProvisioning();
+    return json({ ok: true });
+}