Tag validation should be case insensitive

[Hdom]

Hello, I've noticed that GitHub's runner software tag validation is case insensitive but the login in findPoolByTags seems to be case sensitive.

https://github.com/cloudbase/garm/blob/main/database/sql/pools.go#L187

Our current workaround includes lowercasing input tags and lowercasing stored tags in the comparison:

for i, tag := range tags {
    tags[i] = strings.ToLower(tag)
}
where := fmt.Sprintf("lower(tags.name) in ? and %s = ? and enabled = true", fieldName)

Do you think we could get this included?

[gabriel-samfira]

We can add a COLLATE NOCASE in that WHERE tags.name IN clause. Adding a PR soon.

[gabriel-samfira]

can you give this a try: #296