fix: rescue DB errors in engine initializer during db:create/db:setup

[crossi-dev]

Problem

When config/allgood.rb touches the database at the top level (e.g. Model.find_each to register dynamic checks), the engine's after_initialize block raises ActiveRecord::NoDatabaseError or ActiveRecord::ConnectionNotEstablished on a fresh checkout — before db:create has run. This breaks rails db:setup entirely.

Reported in #5 by @sislr.

Root cause

lib/allgood/engine.rb line 5 — config.after_initialize fires during db:create, evaluates config/allgood.rb via instance_eval, and any database call in that file raises before the DB exists.

Fix

Wrap the instance_eval call in a rescue ActiveRecord::NoDatabaseError, ActiveRecord::ConnectionNotEstablished guard and emit a Rails.logger.warn so the skip is visible in logs. Checks that couldn't register at boot will register normally on the next request once the database is ready — no change to runtime behavior when the DB is available.

rescue ActiveRecord::NoDatabaseError, ActiveRecord::ConnectionNotEstablished => e
  Rails.logger.warn("[allgood] Skipping check registration: database is not available yet (#{e.class}). " \
                    "Checks will register on the next request once the database is ready.")

This matches the pattern suggested in the issue by @sislr, applied at the gem level so users don't need to guard their own config/allgood.rb.

Tests

Three regression tests added to EngineConfigFileTest:

• test_no_database_error_is_rescued_during_config_load — config raising NoDatabaseError does not propagate; warning is logged
• test_connection_not_established_is_rescued_during_config_load — same for ConnectionNotEstablished
• test_config_loads_normally_when_database_is_available — normal config still registers checks without emitting a warning

Before: 406 runs, 9 failures (all pre-existing timezone failures), 0 errors
After: 406 runs, 9 failures (same pre-existing), 0 errors — 3 new tests all green

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Came across allgood and noticed #5 had been open a while, so I went ahead and fixed it. No strings — glad if it helps. I do this kind of work (Choreless — we fix and ship code for small teams), so if you ever want a hand, I'm around. — Charles