Address PR #261 feedback: Add Elixir CI support and fix codespell error

- Add Elixir/Erlang setup to pytest.yml using erlef/setup-beam@v1
- Configure Elixir 1.18.4 and OTP 26.1 for CI compatibility
- Fix codespell false positive for '*cripts' glob pattern with ignore comment
- Resolves CI test failures for Elixir language server integration

test/solidlsp/elixir/test_elixir_ignored_dirs.py

@@ -65,7 +65,7 @@ def test_find_references_ignores_dir(ls_with_ignored_dirs: SolidLanguageServer):
 @pytest.mark.parametrize("repo_path", [Language.ELIXIR], indirect=True)
 def test_refs_and_symbols_with_glob_patterns(repo_path: Path) -> None:
     """Tests that refs and symbols with glob patterns are ignored."""
-    ignored_paths = ["*cripts", "ignored_*"]
+    ignored_paths = ["*cripts", "ignored_*"]  # codespell:ignore cripts
     ls = create_ls(ignored_paths=ignored_paths, repo_path=str(repo_path), language=Language.ELIXIR)
     ls.start()