title: I am unable to upgrade my PHP version in my docker wordpress installation
body: <p>I am trying to move my existing multisite network to the Docker/Kubernetes setup for easy backup and management.
  I have an environment setup at</p>
  <p>MYSQL : 5.7.2</p>
  <p>PHPMYADMIN: Latest</p>
  <p>WordPress: 5.6 (the PHP version in this installation is 7.3 which I need to update)
  I want to upgrade to PHP 8.0.0</p>
  <p>I was suggested to use a docker file which I did,
  --&gt;  <a href="https://github.com/docker-library/wordpress/blob/5bbbfa8909232af10ea3fea8b80302a6041a2d04/latest/php8.0/apache/Dockerfile" rel="nofollow noreferrer">https://github.com/docker-library/wordpress/blob/5bbbfa8909232af10ea3fea8b80302a6041a2d04/latest/php8.0/apache/Dockerfile</a>
  When running this with a correction in line 149 :</p>
  <pre><code>    RUN [&quot;chmod&quot;, &quot;+x&quot;, &quot;docker-entrypoint.sh&quot;]
      ENTRYPOINT [&quot;./docker-entrypoint.sh&quot;]
      CMD [&quot;apache2-foreground&quot;]
  </code></pre>
  <p>I get the following error,</p>
  <blockquote>
  <p>ERROR: for wordpress  Cannot start service wordpress: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: &quot;docker-entrypoint.sh&quot;: executable file not found in $PATH: unknown
  ERROR: Encountered errors while bringing up the project.
  PS C:\Users\dev&gt; docker-compose up -d
  dev_db_1 is up-to-date
  Starting dev_wordpress_1 ...
  Starting dev_wordpress_1 ... error</p>
  <p>ERROR: for dev_wordpress_1  Cannot start service wordpress: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: &quot;docker-entrypoint.sh&quot;: executable file not found in $PATH: unknown<br />
  ERROR: for wordpress  Cannot start service wordpress: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: &quot;docker-entrypoint.sh&quot;: executable file not found in $PATH: unknown
  ERROR: Encountered errors while bringing up the project.</p>
  </blockquote>
  <p>I need your help in getting my WordPress image running, I am unsure about what does this, <code>(docker-entrypoint.sh)</code> contain, or where to place it.</p>
  <p>Your help and guidance is well appreciated in advance.</p>
  <p>Regards,
  Aaditya</p>