Add support for stdout container file handlers
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3550715. --> Reported by: [murz](https://www.drupal.org/user/157092) Related to !3 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Now plugins can output to stdout/stderr directly, but if the request is initialized from the shell command line, the output will go to the command line, instead of the container's stderr/stdout.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>To make the log output always available in the container's stdout/stderr, the solution is to write directly to the special file handlers <code>/proc/1/fd/1</code> and <code>/proc/1/fd/2</code>.</p>
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