Ignore false positives from Ameba

See crystal-ameba/ameba#447

.ameba.yml

@@ -1,13 +1,4 @@
-# This configuration file was generated by `ameba --gen-config`
-# on 2024-07-22 03:45:06 UTC using Ameba version 1.6.1.
-# The point is for the user to remove these configuration records
-# one by one as the reported problems are removed from the code base.
-
-# Problems found: 22
-# Run `ameba --only Documentation/DocumentationAdmonition` for details
 Documentation/DocumentationAdmonition:
-  Description: Reports documentation admonitions
-  Timezone: UTC
   Admonitions:
     - TODO
     - FIXME
@@ -16,3 +7,13 @@ Documentation/DocumentationAdmonition:
   Enabled: true
   Severity: Convention
 # TODO: Address these issues and re-enable the check.
+
+# Ignore false positives.
+# See: https://github.com/crystal-ameba/ameba/issues/447
+Lint/UselessAssign:
+  Enabled: true
+  Excluded:
+    - src/spectator.cr
+    - src/spectator/core/configuration.cr
+    - src/spectator/core/runner.cr
+    - src/spectator/core/source_cache.cr