minor symfony#45158 [GHA] test tty group (nicolas-grekas)

This PR was merged into the 4.4 branch.

Discussion
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[GHA] test tty group

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

From actions/runner#241 (comment)

Commits
-------

6620e2b [GHA] test tty group

Author: nicolas-grekas

.github/workflows/unit-tests.yml

@@ -209,6 +209,11 @@ jobs:
 
           [[ ! $X ]] || (exit 1)
 
+      - name: Run TTY tests
+        if: "! matrix.mode"
+        run: |
+            script -e -c './phpunit --group tty' /dev/null
+
       - name: Run tests with SIGCHLD enabled PHP
         if: "matrix.php == '7.2' && ! matrix.mode"
         run: |