ci: add maximize-space plugin to actions

[vindard]

Description

This is a temporary solution to unblock our stuck PRs because of failing Actions

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Integration / Bats

We have an issue right now where our /nix/store files (~6GB) and buck-out build folder (~11GB) are taking up too much of the ~21GB available on the github runner image disk to successfully execute tests.

There is a ~74GB /mnt partition available though that it seems is meant as a temp disk that just has a swap file and is otherwise unused.

Filesystem      Size  Used Avail Use% Mounted on
/dev/root        73G   53G   21G  73% /
tmpfs           7.9G  172K  7.9G   1% /dev/shm
tmpfs           3.2G  1.1M  3.2G   1% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/sdb15      105M  6.1M   99M   6% /boot/efi
/dev/sda1        74G  4.1G   66G   6% /mnt
tmpfs           1.6G   12K  1.6G   1% /run/user/1001

This plugin concatenates the free space on / and /mnt to a single LVM volume group and then mounts the build volume back to this new larger space.

Filesystem                   Size  Used Avail Use% Mounted on
/dev/root                     73G   61G   12G  84% /
tmpfs                        7.9G  172K  7.9G   1% /dev/shm
tmpfs                        3.2G  1.1M  3.2G   1% /run
tmpfs                        5.0M     0  5.0M   0% /run/lock
/dev/sda15                   105M  6.1M   99M   6% /boot/efi
/dev/sdb1                     74G   58G   12G  83% /mnt
tmpfs                        1.6G   12K  1.6G   1% /run/user/1001

/dev/mapper/buildvg-buildlv   61G   24K   61G   1% /home/runner/work/galoy/galoy

Note: This is a hacky solution since the /mnt folder isn't documented and may be changed or removed later on. It's a signal that we maybe need to either move to a larger paid action runner or switch to our own runner.

quickstart

The nix builds on root folder are pretty much at the ~21GB disk-availale limit right now. They can't be fixed in a straightforward way with the following plugin since the plugin targets re-mapping the workspace volume and not the entire root folder.