buildx failed with: ERROR: failed to solve: process "/bin/sh -c CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} GOARM=${TARGETVARIANT#\"v\"} go build -a -installsuffix cgo -ldflags '-extldflags \"-static\"' -o ./external-dns-cloudns-webhook ./cmd/webhook" did not complete successfully: exit code: 1