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chore: do not use sentinel errors when unneeded
- main reason being it's a burden to always define sentinel errors at global scope, wrap them with `%w` instead of using a string directly - only use sentinel errors when it has to be checked using `errors.Is` - replace all usage of these sentinel errors in `fmt.Errorf` with direct strings that were in the sentinel error - exclude the sentinel error definition requirement from .golangci.yml - update unit tests to use ContainersError instead of ErrorIs so it stays as a "not a change detector test" without requiring a sentinel error
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@@ -11,8 +11,6 @@ import (
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"github.com/qdm12/gluetun/internal/provider/common"
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)
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var ErrNotIPv4 = errors.New("IP address is not IPv4")
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func (u *Updater) FetchServers(ctx context.Context, minServers int) (
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servers []models.Server, err error,
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) {
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