Make Dockerfile download mega binaries according to cpu architecture

Dockerfile

@@ -1,6 +1,7 @@
 FROM ubuntu:20.04
 
 WORKDIR /usr/src/app
+SHELL ["/bin/bash", "-c"]
 RUN chmod 777 /usr/src/app
 RUN apt-get -qq update && \
     DEBIAN_FRONTEND="noninteractive" apt-get -qq install -y tzdata aria2 git python3 python3-pip \
@@ -10,7 +11,7 @@ RUN apt-get -qq update && \
     libcrypto++-dev libssl-dev \
     libc-ares-dev libcurl4-openssl-dev \
     libsqlite3-dev libsodium-dev && \
-    curl -L https://github.com/jaskaranSM/megasdkrest/releases/download/v0.1/megasdkrest -o /usr/local/bin/megasdkrest && \
+    curl -L https://github.com/lzzy12/megasdkrest/releases/download/v0.1.14-rebuild/megasdkrest-$(cpu=$(uname -m); if [[ "$cpu" == "x86_64" ]]; then    echo "amd64"; elif [[ "$cpu" == "x86" ]]; then    echo "i386"; elif [[ "$cpu" == "aarch64" ]]; then    echo "arm64"; else    echo $cpu; fi) -o /usr/local/bin/megasdkrest && \
     chmod +x /usr/local/bin/megasdkrest
 
 COPY requirements.txt .