fix: integration tests are not run in CI (#1221)

Solution:
- make it run
- add python linter job for the python codes
- fix nix expression to build ethermintd

add file diff condition

add gomod2nix check

tests/integration_tests/conftest.py

@@ -2,6 +2,7 @@ import pytest
 
 from .network import setup_ethermint, setup_geth
 
+
 @pytest.fixture(scope="session")
 def ethermint(tmp_path_factory):
     path = tmp_path_factory.mktemp("ethermint")

tests/integration_tests/shell.nix

@@ -9,4 +9,7 @@ pkgs.mkShell {
     pkgs.nodejs
     pkgs.test-env
   ];
+  shellHook = ''
+    . ${../../scripts/.env}
+  '';
 }

tests/integration_tests/test_basic.py

@@ -1,3 +1,3 @@
 def test_basic(cluster):
     w3 = cluster.w3
-    assert w3.eth.chain_id == 9000
+    assert w3.eth.chain_id == 9000