Docker - Update arm* Dockerfiles for latest multiarch

Relates to this change https://github.com/multiarch/qemu-user-static/commit/7bdafb96ee59fde53d07a291f9446d2b8957d372

Dockerfile.arm

@@ -3,11 +3,6 @@
 ARG DOTNET_VERSION=3.0
 
 
-FROM multiarch/qemu-user-static:x86_64-arm as qemu
-FROM alpine as qemu_extract
-COPY --from=qemu /usr/bin qemu-arm-static.tar.gz
-RUN tar -xzvf qemu-arm-static.tar.gz
-
 FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION} as builder
 WORKDIR /repo
 COPY . .
@@ -21,8 +16,9 @@ RUN bash -c "source deployment/common.build.sh && \
     build_jellyfin Jellyfin.Server Release linux-arm /jellyfin"
 
 
+FROM multiarch/qemu-user-static:x86_64-arm as qemu
 FROM mcr.microsoft.com/dotnet/core/runtime:${DOTNET_VERSION}-stretch-slim-arm32v7
-COPY --from=qemu_extract qemu-arm-static /usr/bin
+COPY --from=qemu /usr/bin/qemu-arm-static /usr/bin
 RUN apt-get update \
  && apt-get install --no-install-recommends --no-install-suggests -y ffmpeg \
  && rm -rf /var/lib/apt/lists/* \

Dockerfile.arm64

@@ -3,12 +3,6 @@
 ARG DOTNET_VERSION=3.0
 
 
-FROM multiarch/qemu-user-static:x86_64-aarch64 as qemu
-FROM alpine as qemu_extract
-COPY --from=qemu /usr/bin qemu-aarch64-static.tar.gz
-RUN tar -xzvf qemu-aarch64-static.tar.gz
-
-
 FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION} as builder
 WORKDIR /repo
 COPY . .
@@ -22,8 +16,9 @@ RUN bash -c "source deployment/common.build.sh && \
     build_jellyfin Jellyfin.Server Release linux-arm64 /jellyfin"
 
 
+FROM multiarch/qemu-user-static:x86_64-aarch64 as qemu
 FROM mcr.microsoft.com/dotnet/core/runtime:${DOTNET_VERSION}-stretch-slim-arm64v8
-COPY --from=qemu_extract qemu-aarch64-static /usr/bin
+COPY --from=qemu /usr/bin/qemu-aarch64-static /usr/bin
 RUN apt-get update \
  && apt-get install --no-install-recommends --no-install-suggests -y ffmpeg \
  && rm -rf /var/lib/apt/lists/* \