Fix CI: commit spec/dummy/config/database.yml

Global ~/.gitignore_global blanket-ignores database.yml everywhere. Add
a local negation in .gitignore so the dummy app's in-memory SQLite config
is tracked and CI can boot Rails.

Author: Fivell

.gitignore

@@ -3,6 +3,9 @@
 /gemfiles/*.lock
 /pkg/
 /spec/.rspec-results
+# Override global ~/.gitignore_global that blanket-ignores database.yml:
+# the dummy app's :memory: SQLite config is harmless and required by CI.
+!spec/dummy/config/database.yml
 /spec/dummy/db/*.sqlite3
 /spec/dummy/log/*.log
 /spec/dummy/tmp/

spec/dummy/config/database.yml

@@ -0,0 +1,5 @@
+test:
+  adapter: sqlite3
+  database: ":memory:"
+  pool: 5
+  timeout: 5000