pyinstaller: package default signatures into standalone exe

.github/pyinstaller/pyinstaller.spec

@@ -33,6 +33,7 @@ a = Analysis(
         # this gets invoked from the directory of the spec file,
         # i.e. ./.github/pyinstaller
         ('../../rules', 'rules'),
+        ('../../sigs', 'sigs'),
 
         # capa.render.default uses tabulate that depends on wcwidth.
         # it seems wcwidth uses a json file `version.json`
@@ -108,5 +109,4 @@ exe = EXE(pyz,
 #               a.datas,
 #               strip=None,
 #               upx=True,
-#               name='capa-dat')
-
+#               name='capa-dat')