Disable schedule jobs for forks

.github/workflows/test.yml

@@ -13,6 +13,7 @@ jobs:
       engine: cruby
       min_version: 2.7
   lint:
+    if: github.repository == 'ruby/irb'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -24,6 +25,7 @@ jobs:
       - name: Run rubocop
         run: bundle exec rubocop
   irb:
+    if: github.repository == 'ruby/irb'
     needs: ruby-versions
     name: rake test ${{ matrix.ruby }} ${{ matrix.with_latest_reline && '(latest reline)' || '' }}
     strategy:
@@ -49,6 +51,7 @@ jobs:
       - name: Run tests in isolation
         run: bundle exec rake test_in_isolation
   debug-test:
+    if: github.repository == 'ruby/irb'
     name: Debug compatibility test
     runs-on: ubuntu-latest
     timeout-minutes: 30
@@ -72,6 +75,7 @@ jobs:
           bundle install
           bundle exec rake
   vterm-yamatanooroti:
+    if: github.repository == 'ruby/irb'
     needs: ruby-versions
     name: >-
       vterm-yamatanooroti ${{ matrix.ruby }} ${{ matrix.with_latest_reline && '(latest reline)' || '' }}