Fix action args input type

Author: JamyGolden

action.yml

@@ -4,4 +4,7 @@ description: 'Build all the schemes for a base16 or tinted repo'
 runs:
   using: 'docker'
   image: 'docker://ghcr.io/tinted-theming/tinted-builder-rust:v0.8.0'
-  args: 'build . --sync'
+  args:
+    - build
+    - .
+    - --sync