Support Pi 4 on 64bit kernel

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

@@ -12,7 +12,7 @@ if [[ "$OSTYPE" == "linux"* ]]; then
 		OS_NAME="linux32"
 	elif [[ "$OSBITS" == "x86_64" ]]; then
 		OS_NAME="linux64"
-	elif [[ "$OSBITS" == "armv7l" ]]; then
+	elif [[ "$OSBITS" == "armv7l" || "$OSBITS" == "aarch64" ]]; then
 		OS_NAME="linuxarm"
 	else
 		OS_NAME="$OSTYPE-$OSBITS"
@@ -214,4 +214,3 @@ function build_sketches() # build_sketches <fqbn> <examples-path> <chunk> <total
     done
     return 0
 }
-

tools/get.py

@@ -122,7 +122,7 @@ def get_tool(tool):
             f.write(r.content)
             f.close()
         else:
-            is_ci = os.environ.get('TRAVIS_BUILD_DIR');
+            is_ci = os.environ.get('GITHUB_WORKSPACE');
             if is_ci:
                 download_file(url, local_path)
             else:
@@ -159,7 +159,7 @@ def identify_platform():
     sys_name = platform.system()
     sys_platform = platform.platform()
     print('System: %s, Info: %s' % (sys_name, sys_platform))
-    if 'Linux' in sys_name and sys_platform.find('arm') > 0:
+    if 'Linux' in sys_name and (sys_platform.find('arm') > 0 or sys_platform.find('aarch64')):
         sys_name = 'LinuxARM'
     if 'CYGWIN_NT' in sys_name:
         sys_name = 'Windows'