ci(install): Change "arch" to distro-agnostic "uname -m" (espressif#9537)

Author: lucasssvaz

.github/scripts/install-arduino-cli.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-OSBITS=`arch`
+OSBITS=`uname -m`
 if [[ "$OSTYPE" == "linux"* ]]; then
     export OS_IS_LINUX="1"
     if [[ "$OSBITS" == "i686" ]]; then

.github/scripts/install-arduino-ide.sh

@@ -4,7 +4,7 @@
 #OSTYPE: 'msys', ARCH: 'x86_64' => win32
 #OSTYPE: 'darwin18', ARCH: 'i386' => macos
 
-OSBITS=`arch`
+OSBITS=`uname -m`
 if [[ "$OSTYPE" == "linux"* ]]; then
     export OS_IS_LINUX="1"
     ARCHIVE_FORMAT="tar.xz"