use pkg.tar.zst for arch

Makefile

@@ -68,8 +68,8 @@ WINDOWS_ZRYTHM_PKG_TAR_XZ=
 RPMBUILD_ROOT=/home/ansible/rpmbuild
 BUILD_FEDORA32_DIR=$(BUILD_DIR)/fedora32
 BUILD_OPENSUSE_TUMBLEWEED_DIR=$(BUILD_DIR)/opensuse-tumbleweed
-ARCH_PKG_FILE=zrythm-$(ZRYTHM_PKG_VERSION)-1-x86_64.pkg.tar.xz
-ARCH_TRIAL_PKG_FILE=zrythm-trial-$(ZRYTHM_PKG_VERSION)-1-x86_64.pkg.tar.xz
+ARCH_PKG_FILE=zrythm-$(ZRYTHM_PKG_VERSION)-1-x86_64.pkg.tar.zst
+ARCH_TRIAL_PKG_FILE=zrythm-trial-$(ZRYTHM_PKG_VERSION)-1-x86_64.pkg.tar.zst
 DEBIAN_PKG_FILE=zrythm_$(ZRYTHM_PKG_VERSION)-1_amd64.deb
 DEBIAN_TRIAL_PKG_FILE=zrythm-trial_$(ZRYTHM_PKG_VERSION)-1_amd64.deb
 FEDORA32_PKG_FILE=zrythm-$(ZRYTHM_PKG_VERSION)-1.fc32.x86_64.rpm

installer.sh.in

@@ -166,7 +166,7 @@ if [ $proceed -ne 0 ]; then
   elif [[ $distro_identifier = "archlinux" ]]; then
     ask_for_root_pw;
     sudo /bin/sh -c \
-      "pacman -U --noconfirm \"$prefix-1_${architecture}.pkg.tar.xz\"" && \
+      "pacman -U --noconfirm \"$prefix-1_${architecture}.pkg.tar.zst\"" && \
       print_install_success
   fi
 fi

tools/gen_installer.sh

@@ -73,7 +73,7 @@ get_dest_package_filename () {
       res="$prefix-1_amd64.deb"
       ;;
     "archlinux")
-      res="$prefix-1_x86_64.pkg.tar.xz"
+      res="$prefix-1_x86_64.pkg.tar.zst"
       ;;
     "fedora32")
       res="$prefix-1_x86_64.rpm"