Add experimental Raspbian aarch64 build

Dockerfile.rpi.buster64

@@ -0,0 +1,26 @@
+FROM arm64v8/debian:buster
+
+ENV TARGET=rpi64
+
+COPY scripts/install-base-deps.sh /opt/scripts/
+RUN /bin/bash -c /opt/scripts/install-base-deps.sh && \
+    apt-get install -y --no-install-recommends gnupg && \
+    echo "deb http://archive.raspberrypi.org/debian/ buster main" >> /etc/apt/sources.list && \
+    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 82B129927FA3303E && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends linux-libc-dev && \
+    apt-get clean -y && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY rpi-userland /opt/rpi-userland
+COPY FFmpeg-rpi /opt/FFmpeg
+COPY SDL2 /opt/SDL2
+COPY SDL_ttf /opt/SDL_ttf
+
+COPY scripts/build-deps.sh /opt/scripts/
+RUN /bin/bash -c /opt/scripts/build-deps.sh
+
+COPY scripts/build-package.sh /opt/scripts/
+
+VOLUME "/out"
+ENTRYPOINT [ "/bin/bash", "-c", "/opt/scripts/build-package.sh" ]