PHP_WORKER_INSTALL_GEARMAN=true not installing gearman!

[sohaibilyas]

Info:

• Docker version ($ docker --version): version 18.09.7, build 2d0083d
• Laradock commit ($ git rev-parse HEAD): d732318
• System info (Mac, PC, Linux): Linux
• System info disto/version: 18.04.1-Ubuntu

Issue:

After PHP_WORKER_INSTALL_GEARMAN=true getting the error below:
error: /usr/src/php/ext/gearman does not exist

usage: /usr/local/bin/docker-php-ext-install [-jN] ext-name [ext-name ...]
ie: /usr/local/bin/docker-php-ext-install gd mysqli
/usr/local/bin/docker-php-ext-install pdo pdo_mysql
/usr/local/bin/docker-php-ext-install -j5 gd mbstring mysqli pdo pdo_mysql shmop

if custom ./configure arguments are necessary, see docker-php-ext-configure

Possible values for ext-name:
bcmath bz2 calendar ctype curl dba dom enchant exif fileinfo filter ftp gd gettext gmp hash iconv imap interbase intl json ldap mbstring mysqli oci8 odbc opcache pcntl pdo pdo_dblib pdo_firebird pdo_mysql pdo_oci pdo_odbc pdo_pgsql pdo_sqlite pgsql phar posix pspell readline recode reflection session shmop simplexml snmp soap sockets sodium spl standard sysvmsg sysvsem sysvshm tidy tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl zend_test zip

Some of the above modules are already compiled into PHP; please check
the output of "php -i" to see which modules are already loaded.

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Expected behavior:

It should install gearman in php-worker container so it can run Gearman related classes.

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Reproduce:

On fresh laradock simply set PHP_WORKER_INSTALL_GEARMAN=true you'll get error that gearman cant be installed!

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Relevant Code:

// place a code sample here