fix(ci): drop invalid -y flag from snapshot delete (CLI has no -y; delete is non-interactive)

The old 'snapshot delete cheatcode-sandbox -y' failed on the unknown -y flag (swallowed by
2>/dev/null || true), so the follow-up create hit 'already exists'. delete without -y is
non-interactive.

Author: iamjr15

.github/workflows/build-snapshot.yml

@@ -41,7 +41,7 @@ jobs:
         run: |
           # Idempotent: drop the previous snapshot of this name (existing sandboxes
           # are unaffected — they already hold their own copy) then rebuild.
-          daytona snapshot delete cheatcode-sandbox -y 2>/dev/null || true
+          daytona snapshot delete cheatcode-sandbox 2>/dev/null || true
           daytona snapshot create cheatcode-sandbox \
             -f infra/containers/sandbox/Dockerfile \
             -c infra/containers/sandbox \