Added test check to ubuntu on GitHub Actions

Merged: https://github.com/ruby/ruby/pull/2379

.github/workflows/ubuntu.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        test_task: [ "test-bundler", "test-bundled-gems" ]
+        test_task: [ "check", "test-bundler", "test-bundled-gems" ]
       fail-fast: false
     steps:
       - name: Install libraries
@@ -46,6 +46,13 @@ jobs:
         run: ./configure -C --disable-install-doc
       - run: make $JOBS
       # TODO: Remove `continue-on-error` once they become stable and also we have a notification for their failure.
+      - name: make check
+        run: make -s ${{ matrix.test_task }}
+        env:
+          TESTOPTS: "$JOBS -q --tty=no"
+          MSPECOPT: "-ff" # not using `-j` because sometimes `mspec -j` silently dies
+        if: matrix.test_task == 'check'
+        continue-on-error: true
       - name: make test-bundler/test-bundled-gems
         run: make -s ${{ matrix.test_task }}
         continue-on-error: true