[ENH] Slim down the Docker images even further

[skyzyx]

Remove

• /usr/share/terminfo (2.7 MB)
• /usr/local/bin/phpdbg (15 MB)
• /usr/local/bin/php-cgi (15 MB)
• /usr/local/include/php (5.2 MB) ???
• /var/cache/apk/* (1.3 MB)
• /tmp/*
• /root/.composer/cache (24 MB)
• libgpg?
• git?
• /usr/local/lib/php/...
  • .channels/
  • .depdb
  • .depdblock
  • .filemap
  • .lock
  • .registry/
  • Archive/
  • Console/
  • OS/
  • PEAR/
  • PEAR.php
  • Structures/
  • System.php
  • XML/
  • data/
  • doc/
  • pearcmd.php
  • peclcmd.php
  • test/
• /usr/local/php
• /usr/src (12 MB)

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