tests: run all tests, but exclude tests specific to my computer from CI

controllable via HPI_TESTS_KARLICOSS=true

tests/lastfm.py

@@ -1,13 +1,16 @@
+from .common import skip_if_not_karlicoss as pytestmark
+
+# todo maybe belongs to common
 from more_itertools import ilen
 
-from my.lastfm import scrobbles
 
-
-def test():
+def test() -> None:
+    from my.lastfm import scrobbles
     assert ilen(scrobbles()) > 1000
 
 
-def test_datetime_ascending():
+def test_datetime_ascending() -> None:
+    from my.lastfm import scrobbles
     from more_itertools import pairwise
     for a, b in pairwise(scrobbles()):
         assert a.dt <= b.dt