Try building for aarch64 too

Dockerfile

@@ -1,5 +1,29 @@
 ## Buildstage ##
-FROM ghcr.io/linuxserver/baseimage-alpine:3.17 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:3.17 as buildstage-amd64
+
+RUN \
+  echo "**** install packages ****" && \
+  apk add -U --update --no-cache --virtual=build-dependencies \
+    autoconf \
+    automake \
+    build-base && \
+  echo "**** install par2cmdline-turbo from source ****" && \
+  mkdir /tmp/par2cmdline && \
+  curl -o \
+    /tmp/par2cmdline.tar.gz -L \
+    "https://github.com/animetosho/par2cmdline-turbo/archive/refs/heads/turbo.tar.gz" && \  
+  tar xf \
+    /tmp/par2cmdline.tar.gz -C \
+    /tmp/par2cmdline --strip-components=1 && \
+  cd /tmp/par2cmdline && \
+  ./automake.sh && \
+  ./configure && \
+  make && \
+  make check && \
+  make install DESTDIR=/root-layer
+
+## Buildstage ##
+FROM --platform=aarch64 ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.17 as buildstage-aarch64
 
 RUN \
   echo "**** install packages ****" && \
@@ -22,8 +46,6 @@ RUN \
   make check && \
   make install DESTDIR=/root-layer
 
-# copy local files
-COPY root/ /root-layer/
 
 ## Single layer deployed image ##
 FROM scratch
@@ -31,4 +53,5 @@ FROM scratch
 LABEL maintainer="thespad"
 
 # Add files from buildstage
-COPY --from=buildstage /root-layer/ /
+COPY --from=buildstage-amd64 /root-layer/ /amd64
+COPY --from=buildstage-aarch64 /root-layer/ /aarch64