Provider assumes apt for linux os

[gustaff-weldon]

Currently, the provider assumes that runner image for linux contains apt

garm-provider-gcp/internal/spec/spec.go

Lines 296 to 307 in 494d2ef

	"sudo useradd -m " + defaults.DefaultUser + " || true",
	// Create the runner home directory if it doesn't exist
	"sudo mkdir -p /home/" + defaults.DefaultUser,
	// Add user to sudoers
	"sudo usermod -aG sudo " + defaults.DefaultUser,
	// Check curl and tar are installed
	"sudo apt-get update && sudo apt-get install -y curl tar",
	// Install the runner
	"echo " + asBase64 + " | base64 -d > /install_runner.sh",
	"chmod +x /install_runner.sh",
	"echo 'runner ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/garm",
	"su -l -c /install_runner.sh " + defaults.DefaultUser,

This makes it difficult to use custom runner images based eg. on Alpine

[gabriel-samfira]

Alpine might not work. Not sure if the gh runner supoorts it.

[fabi200123]

Hello there!
The PR #25 will update the way the GCP provider works for linux. Now it will allows just linux images that have cloud-init on them so the provider will not assume anymore that apt is installed on the instances.

[gabriel-samfira]

Closed via #25