migrate oc init command from urfave/cli to spf13/cobra

Signed-off-by: Christian Richter <c.richter@opencloud.eu>

vendor/github.com/spf13/viper/logger.go

@@ -0,0 +1,31 @@
+package viper
+
+import (
+	"context"
+	"log/slog"
+)
+
+// WithLogger sets a custom logger.
+func WithLogger(l *slog.Logger) Option {
+	return optionFunc(func(v *Viper) {
+		v.logger = l
+	})
+}
+
+type discardHandler struct{}
+
+func (n *discardHandler) Enabled(_ context.Context, _ slog.Level) bool {
+	return false
+}
+
+func (n *discardHandler) Handle(_ context.Context, _ slog.Record) error {
+	return nil
+}
+
+func (n *discardHandler) WithAttrs(_ []slog.Attr) slog.Handler {
+	return n
+}
+
+func (n *discardHandler) WithGroup(_ string) slog.Handler {
+	return n
+}