[github] Lower timeout for github actions

If the LiveTests generate endless loops and the test's timeout mechanism
doesn't terminate it, the action can run for multiple hours.

Change-Id: I20d40fcb95d8c526320db3439624cf4d7079ef78
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/8633202
Auto-Submit: Matthias Liedtke <[email protected]>
Commit-Queue: Matthias Liedtke <[email protected]>
Reviewed-by: Danylo Mocherniuk <[email protected]>

Author: Liedtke

.github/workflows/swift.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   build:
+    timeout-minutes: 30
     strategy:
       matrix:
         os: [macos-latest, ubuntu-latest]