Fixed the laravel sample application

[imonroe]

What I changed:

• in the Dockerfile, it called for mysql-client, but the new php-7.2 image needs that to be changed to mariadb-client. See: https://stackoverflow.com/questions/57048428/e-package-mysql-client-has-no-installation-candidate-in-php-fpm-image-build-u
• in the ./configuration/nginx/conf.d/app.conf file, there is a note that the fastcgi_pass variable needs to be changed to reflect the name of the container. I changed it to project_laravel to ensure it would come up correctly.
• in the docker-compose.yml file, the context to build the app image was listed as ./laravel-app, but that's not where the dockerfile lives. Changed it to just ., which fixes the build.
  I then re-tarred the file and replaced the one in the repo.

[githubsaturn]

Thanks @imonroe !

I have to park this PR for a few days until I find a new home for sample apps. The current way of bundling them with the main repo has made the repo way too bloated. I'll split them out and will let you know the new format.

[imonroe]

No problem. I was tempted to exclude the vendor directory to reduce the size of the tar, but I figured if it was there, it was probably for a good reason.

[sleeyax]

Sooooooo is this PR ever gonna get merged?

[githubsaturn]

TLDR:
No. I just kept the PR open for people who are interested. You can download the tar from the source of the PR: https://github.com/imonroe/caprover/blob/fix-laravel/captain-sample-apps/laravel.tar

The tar file is too large to be merged into the main repo. I was planning on creating a separate repo for sample apps, but I haven't gotten to it yet. Alternatively, some people started hosting their own sample repos and added them to the Community Apps Section. Feel free to do that.

[imonroe]

I likely should update my fork to update PHP to 7.3 and Laravel to 7.x I'll see if I can do that this weekend.