test(conf): cover CR_CONF_Database.Name env override (#3327)

The env-override rework in d00f447 fixed Section.Key parsing; lock the
behavior in with a regression test so dbname cannot silently fall back
to the username again.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pkg/conf/conf_test.go

@@ -0,0 +1,27 @@
+package conf
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/cloudreve/Cloudreve/v4/pkg/logging"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEnvOverrideDatabaseName(t *testing.T) {
+	dir := t.TempDir()
+	confPath := filepath.Join(dir, "conf.ini")
+	require.NoError(t, os.WriteFile(confPath, []byte("[System]\nDebug = false\nMode = master\nListen = :5212\nSessionSecret = s\nHashIDSalt = s\n"), 0644))
+
+	t.Setenv("CR_CONF_Database.Type", "postgres")
+	t.Setenv("CR_CONF_Database.Host", "postgresql")
+	t.Setenv("CR_CONF_Database.User", "user")
+	t.Setenv("CR_CONF_Database.Name", "database")
+	t.Setenv("CR_CONF_Database.Port", "5432")
+
+	p, err := NewIniConfigProvider(confPath, logging.NewConsoleLogger(logging.LevelDebug))
+	require.NoError(t, err)
+	require.Equal(t, "user", p.Database().User)
+	require.Equal(t, "database", p.Database().Name)
+}