Increase memory for VM build

[Yorwba]

I rebuilt my VM today after upgrading to a new version of VirtualBox and ran into an issue with one of the C++ compilation steps failing with an out-of-memory error. The build succeeded once I doubled the available memory.

[jiru]

2GB feels like a lot; it would increase the RAM requirement of the host running the VM to 4GB or more. How about we try to optimize memory usage of the build process instead? Compilation can use a lot of memory but I think we should be able to get away with 1GB. It’s not like we are compiling super big projects.

Do you remember which step produced the error? Here are some suggestions:

• Maybe Tatoeba/Tatodetect@262d407 is causing the problem? (Sinoparserd also uses -j 2 but it’s supposedly lightweight to compile.)
• What if you reorder tasks in ansible/tatoeba.tasks.yml so that the problematic compilation step happens first, before installing and starting up nginx, mysql and php?

[Yorwba]

Closing in favor of Tatoeba/Tatodetect#3