fix: rework zipping of files, better build CI

Thanks to @npv12 for this PR!

build.py

@@ -1,17 +0,0 @@
-import shutil
-from zipfile import ZipFile
-
-from scripts.create_theme import create_theme
-from scripts.ctp_colors import ctp_colors, get_all_accent
-from scripts.var import tmp_dir
-
-for flavor, value in ctp_colors.items():
-    for accent in get_all_accent(value).keys():
-        print("\n\n\nCreating theme for", flavor, "with accent", accent)
-        filename = tmp_dir + '/' + create_theme(flavor, accent)
-        filenames = [filename, filename + '-xhdpi', filename + '-hdpi']
-
-        with ZipFile(filename + '.zip', 'w') as zip:
-            for filename in filenames:
-                zip.write(filename)
-                shutil.rmtree(filename)