test: fix unit test failures after main rebase

- test_egress: expect MissingEnvVarError instead of Die for missing/empty token refs
- test_git_gate, test_git_gate_render_provision: expect MissingEnvVarError instead of RuntimeError for missing forge token
- test_smolmachines_provision: handle 2 exec calls (mkdir -p + chmod/update-ca-certificates) in provision_ca
- test_smolmachines_smolvm: update machine create/delete argv assertions to --name flag form (smolvm 1.4.7+)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/test_egress.py

@@ -19,7 +19,7 @@ from bot_bottle.egress import (
     egress_sidecar_env_entries,
     egress_token_env_map,
 )
-from bot_bottle.log import Die
+from bot_bottle.errors import MissingEnvVarError
 from bot_bottle.manifest import ManifestIndex
 from bot_bottle.yaml_subset import parse_yaml_subset
 
@@ -499,14 +499,14 @@ class TestResolveTokenValues(unittest.TestCase):
         self.assertEqual({"EGRESS_TOKEN_0": "the-value"}, out)
 
     def test_missing_token_ref_dies(self):
-        with self.assertRaises(Die):
+        with self.assertRaises(MissingEnvVarError):
             egress_resolve_token_values(
                 {"EGRESS_TOKEN_0": "GH_PAT"},
                 {},
             )
 
     def test_empty_token_ref_dies(self):
-        with self.assertRaises(Die):
+        with self.assertRaises(MissingEnvVarError):
             egress_resolve_token_values(
                 {"EGRESS_TOKEN_0": "GH_PAT"},
                 {"GH_PAT": ""},