gitlab_runner: Cap Docker's memory to 95% of system memory
The arch-iso project uses QEMU for building and it uses a lot of memory (they have crashed runner2 twice), so let's see if we can avoid that by capping Docker's memory.
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The arch-iso project uses QEMU for building and it uses a lot of memory (they have crashed runner2 twice), so let's see if we can avoid that by capping Docker's memory.