Merge pull request #2777 from SupernaviX/sg/syntax-error-fix

fix: syntax error in shell script

Author: jpraynaud

mithril-install.sh

@@ -84,8 +84,7 @@ case "$ARCH" in
   x86_64)
     ARCH_NAME="x64"
     ;;
-  arm64)
-  aarch64)
+  arm64|aarch64)
     ARCH_NAME="arm64"
     ;;
   *)