Fix pg_ident to allow multiple mappings per map name

[Copilot]

• Analyze CI error logs to identify the issue
• Fix NoMethodError in libraries/ident.rb split_entries method
• Add nil check for SPLIT_REGEX.match() to handle non-matching lines
• Test the fix locally to ensure it works correctly
• Verify CI passes with the fix

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[github-actions]

Slowest examples

Top 10 slowest examples (0.02 seconds, 54.12% of total time)

Example	Description	Time in seconds
spec/libraries/helpers_spec.rb:19	PostgreSQL::Cookbook::Helpers#data_dir(version) with rhel family and Postgres 11 from repo returns the correct path	0.01302
spec/libraries/ident_spec.rb:32	PostgreSQL::Cookbook::IdentHelpers::PgIdent::PgIdentFile#add allows multiple entries with the same map_name but different system/database usernames	0.00333
spec/libraries/ident_spec.rb:80	PostgreSQL::Cookbook::IdentHelpers::PgIdent::PgIdentFile#entry returns first entry when only map_name is provided and multiple entries exist	0.00274
spec/libraries/helpers_spec.rb:81	PostgreSQL::Cookbook::Helpers#conf_dir(version) with debian family and Postgres 11 from os returns the correct path	0.00044
spec/libraries/helpers_spec.rb:35	PostgreSQL::Cookbook::Helpers#data_dir(version) with debian family and Postgres 11 from repo returns the correct path	0.0004
spec/libraries/helpers_spec.rb:27	PostgreSQL::Cookbook::Helpers#data_dir(version) with rhel family and Postgres 11 from os returns the correct path	0.00039
spec/libraries/helpers_spec.rb:43	PostgreSQL::Cookbook::Helpers#data_dir(version) with debian family and Postgres 11 from os returns the correct path	0.00038
spec/libraries/helpers_spec.rb:27	PostgreSQL::Cookbook::Helpers#data_dir(version) with rhel family and Postgres 12 from os returns the correct path	0.00037
spec/libraries/helpers_spec.rb:103	PostgreSQL::Cookbook::Helpers#default_platform_service_name(version) with rhel family and Postgres 11 from os returns the correct service name	0.00037
spec/libraries/helpers_spec.rb:43	PostgreSQL::Cookbook::Helpers#data_dir(version) with debian family and Postgres 13 from os returns the correct path	0.00036

[ramereth]

@copilot look at the error in the CI logs and fix the issue

[Copilot]

@copilot look at the error in the CI logs and fix the issue

Fixed the NoMethodError in the CI logs. The issue was in the split_entries method where SPLIT_REGEX.match(entry) could return nil for lines that don't match the expected pg_ident format (like empty lines or comments), and calling .named_captures on nil caused the error. Added a nil check to handle non-matching lines gracefully. Fix committed in b0ad5f4.