gpu-dawn: CI: upload headers.json + tarball

Fixes hexops/mach#171
Helps hexops/mach#109

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu-dawn/dev/dir_to_json.py

@@ -0,0 +1,12 @@
+import os
+import json
+
+def dir_to_dict(d):
+    dict = {}
+    for dirpath,_,filenames in os.walk(d):
+        for f in filenames:
+            path = os.path.join(dirpath, f)
+            dict[path] = open(path, 'r').read()
+    return dict
+
+print(json.dumps(dir_to_dict('.')))