[zeroconfig] Default nodejs to corepack enabled

[mikeland73]

Summary

• Adds DEVBOX_COREPACK_ENABLED: "1" to nodejs detector.
• Adds ability to set env programmatically on config. (This probably doesn't work with interspaced comments)

How was it tested?

• Unit tests
• Manually created project with package.json and then did devbox init --auto

[LucilleH]

The above logic seems so convoluted - what's hujson.ObjectMember?

Is there a simpler representation? Something like

env := [key, val, key, val]
members := make(map[string]string)

for i := 0; i < len(env); i += 2 {
    members[env[i]] = env[i+1]
}

I'm not sure about this part of the logic as I don't understand it. Maybe @gcurtis knows better.

Approving for the rest of the NodeJS logic 👍

[mikeland73]

I'm not sure if we can get rid of any of the code because hujson api is pretty generic so everything needs to be explicit. Maybe I can refactor some portions out:

func (c *configAST) createMemberIfMissing(key string) *hujson.ObjectMember {
	i := c.memberIndex(c.root.Value.(*hujson.Object), key)
	if i == -1 {
		c.root.Value.(*hujson.Object).Members = append(c.root.Value.(*hujson.Object).Members, hujson.ObjectMember{
			Name: hujson.Value{Value: hujson.String(key)},
		})
		i = len(c.root.Value.(*hujson.Object).Members) - 1
	}
	return &c.root.Value.(*hujson.Object).Members[i]
}

func mapToObjectMembers(env map[string]string) []hujson.ObjectMember {
	members := make([]hujson.ObjectMember, 0, len(env))
	for k, v := range env {
		members = append(members, hujson.ObjectMember{
			Name:  hujson.Value{Value: hujson.String(k)},
			Value: hujson.Value{Value: hujson.String(v)},
		})
	}
	return members
}

func (c *configAST) setEnv(env map[string]string) {
	c.createMemberIfMissing("env").Value.Value = &hujson.Object{
		Members: mapToObjectMembers(env),
	}
	c.root.Format()
}