Update CI.yml

Author: juliohm

.github/workflows/CI.yml

@@ -4,21 +4,12 @@ on:
     branches:
       - main
     tags: ['*']
-  pull_request:
-  workflow_dispatch:
-concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+env:
+  JULIA_NUM_THREADS: 2
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
-    timeout-minutes: 60
-    permissions: # needed to allow julia-actions/cache to proactively delete old caches that it has created
-      actions: write
-      contents: read
     strategy:
       fail-fast: false
       matrix: