Pass BUILDTAGS argument to go build

Signed-off-by: Marcus Pettersen Irgens <m@mrcus.dev>

Dockerfile

@@ -27,7 +27,7 @@ RUN --mount=type=bind,target=/go/src/github.com/docker/distribution,rw \
     --mount=type=cache,target=/root/.cache/go-build \
     --mount=target=/go/pkg/mod,type=cache \
     --mount=type=bind,source=/tmp/.ldflags,target=/tmp/.ldflags,from=version \
-      set -x ; xx-go build -trimpath -ldflags "$(cat /tmp/.ldflags) ${LDFLAGS}" -o /usr/bin/registry ./cmd/registry \
+      set -x ; xx-go build -trimpath -ldflags "$(cat /tmp/.ldflags) ${LDFLAGS}" -tags="${BUILDTAGS}" -o /usr/bin/registry ./cmd/registry \
       && xx-verify --static /usr/bin/registry
 
 FROM scratch AS binary