added support for arm64

added arm64 support for update.
Tested on Arch amd64, Debian arm64 and Alpine amd64

rel/files/bin/pleroma_ctl

@@ -2,7 +2,11 @@
 # XXX: This should be removed when elixir's releases get custom command support
 
 detect_flavour() {
-    arch="amd64"
+	machine_type=$(uname -m)
+	if [ ${machine_type} = 'aarch64' ] ; then
+		arch='arm64'
+	elif [ ${machine_type} = 'x86_64' ] ; then
+		arch='amd64'
 		if getconf GNU_LIBC_VERSION >/dev/null; then
 			libc_postfix=""
 		elif [ "$(ldd 2>&1 | head -c 9)" = "musl libc" ]; then
@@ -13,10 +17,13 @@ detect_flavour() {
 			echo "Unsupported libc" >&2
 			exit 1
 		fi
+	else
+		echo "Could not detect your architecture please pass them via --flavour"
+		exit 1
+    fi
 
     echo "$arch$libc_postfix"
 }
-
 detect_branch() {
 	version="$(cut -d' ' -f2 <"$RELEASE_ROOT"/releases/start_erl.data)"
 	# Expected format: major.minor.patch_version(-number_of_commits_ahead_of_tag-gcommit_hash).branch