Multi-arch builds

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=${TARGETPLATFORM:-linux/amd64} ubuntu:19.10
+FROM --platform=${BUILDPLATFORM:-linux/amd64} ubuntu:19.10
 
 ARG BUILDPLATFORM
 ARG TARGETPLATFORM
@@ -8,18 +8,22 @@ ARG TARGETARCH
 RUN apt-get update && apt-get install -y curl ca-certificates
 RUN export URL="https://mega.nz/linux/MEGAsync/Raspbian_10.0/armhf/megacmd-Raspbian_10.0_armhf.deb" && \
     if [ "${TARGETARCH}" = "amd64" ] ; then export URL="https://mega.nz/linux/MEGAsync/xUbuntu_19.10/amd64/megacmd-xUbuntu_19.10_amd64.deb" ; fi && \
-    curl -k -o megacmd.deb $URL
-RUN apt install -y ./megacmd.deb
+    curl -k -o /megacmd.deb $URL
+RUN adduser --disabled-password --gecos '' mega && adduser mega sudo && echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 ADD entrypoint.sh /
 RUN chmod +x /entrypoint.sh
 
-RUN adduser --disabled-password --gecos '' mega && adduser mega sudo && echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
-USER mega
 
+FROM --platform=${TARGETPLATFORM:-linux/amd64} ubuntu:19.10
+USER mega
 WORKDIR /home/mega
 
+COPY --from=builder /etc/sudoers /etc/sudoers
+COPY --from=builder /entrypoint.sh /entrypoint.sh
+COPY --from=builder /megacmd.deb /megacmd.deb
+RUN apt install -y ./megacmd.deb
+
 ENV PASSWORD=
 ENV EMAIL=
-
 CMD /entrypoint.sh