Add ARM64/aarch64 support, add cleanup logic

Author: dennisameling

action.yml

@@ -11,7 +11,7 @@ inputs:
     default: 'minimal'
   architecture:
     required: false
-    description: 'The architecture of the SDK: x86_64 or i686'
+    description: 'The architecture of the SDK: x86_64, i686 or aarch64. Note that "aarch64" uses the x86_64 SDK, but adds "clangarm64" to the path.'
     default: 'x86_64'
   msys:
     required: false
@@ -32,3 +32,4 @@ inputs:
 runs:
   using: 'node16'
   main: 'dist/index.js'
+  post: 'dist/index.js'