watcherDefaultTasks.xml

<application>
  <component name="ApplicationTasksOptions">
    <TaskOptions isEnabled="true">
      <option name="arguments" value="run --rm -v $ProjectFileDir$:/app/build php-cs-fixer fix /app/build/$FileDirRelativeToProjectRoot$/$FileName$" />
      <option name="checkSyntaxErrors" value="true" />
      <option name="description" />
      <option name="exitCodeBehavior" value="ERROR" />
      <option name="fileExtension" value="php" />
      <option name="immediateSync" value="true" />
      <option name="name" value="PHP CS Fixer" />
      <option name="output" value="$ProjectFileDir$" />
      <option name="outputFilters">
        <array />
      </option>
      <option name="outputFromStdout" value="false" />
      <option name="program" value="docker" />
      <option name="scopeName" value="Project Files" />
      <option name="trackOnlyRoot" value="false" />
      <option name="workingDir" value="" />
      <envs />
    </TaskOptions>
  </component>
</application>