Improved run-api-tests.sh script to make it compatible with sh

.github/workflows/ci-tests.yml

@@ -28,7 +28,6 @@ jobs:
           php-extensions: openswoole-4.11.1
           extensions-cache-key: tests-extensions-${{ matrix.php-version }}-${{ inputs.test-group }}
       - run: composer test:${{ inputs.test-group }}:ci
-        shell: bash
       - uses: actions/upload-artifact@v3
         if: ${{ matrix.php-version == '8.1' }}
         with:

.github/workflows/ci.yml

@@ -49,7 +49,6 @@ jobs:
       - run: composer install --no-interaction --prefer-dist
       - run: ./vendor/bin/rr get --location bin/ && chmod +x bin/rr
       - run: composer test:api:rr
-        shell: bash
 
   cli-tests:
     uses: './.github/workflows/ci-tests.yml'