Create a /tmp directory awkwardly

Dockerfile

@@ -5,11 +5,13 @@ WORKDIR /usr/local/go/src/github.com/google/mtail
 RUN apk add build-base git \
     && git clone https://github.com/google/mtail . \
     && make install_deps \
-    && CGO_ENABLED=0 GOOS=linux go build -o /usr/bin/mtail -a -ldflags '-extldflags "-static"' ./cmd/mtail
+    && CGO_ENABLED=0 GOOS=linux go build -o /usr/bin/mtail -a -ldflags '-extldflags "-static"' ./cmd/mtail \
+    && mkdir /tmp/empty
 
 FROM scratch
 
 COPY --from=build /usr/bin/mtail /mtail
+COPY --from=build /tmp/empty /tmp
 
 EXPOSE 3903
 ENTRYPOINT ["/mtail", "-logtostderr"]