[wp-trac] [WordPress Trac] #55700: Move the Memcached container into the Docker Compose config

[WordPress Trac]

#55700: Move the Memcached container into the Docker Compose config
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 Reporter:  johnbillion       |      Owner:  (none)
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 When the test suite runs, two jobs run with Memcached enabled and the
 object-cache.php dropin in place. This setup happens inside the GitHub
 Action.

 Let's move it into the Docker Compose config so a developer can make use
 of it on their local dev environment just by toggling the value of the
 `LOCAL_PHP_MEMCACHED` environment variable in the `.env` file.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55700>
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