feat: writing logs to the filesystem with rotation support (#1299)

* refactor: move lib/policy/config to lib/config

Signed-off-by: Xe Iaso <me@xeiaso.net>

* refactor: don't set global loggers anymore

Ref #864

You were right @kotx, it is a bad idea to set the global logger
instance.

Signed-off-by: Xe Iaso <me@xeiaso.net>

* feat(config): add log sink support

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: update spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore(test): go mod tidy

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: update spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* docs(admin/policies): add logging block documentation

Signed-off-by: Xe Iaso <me@xeiaso.net>

* docs: update CHANGELOG

Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix(cmd/anubis): revert this change, it's meant to be its own PR

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: go mod tidy

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test: add file logging smoke test

Assisted-by: GLM 4.6 via Claude Code
Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix: don't expose the old log file time format string

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/config/opengraph_test.go

@@ -0,0 +1,67 @@
+package config
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestOpenGraphFileConfigValid(t *testing.T) {
+	for _, tt := range []struct {
+		err   error
+		input *openGraphFileConfig
+		name  string
+	}{
+		{
+			name: "basic happy path",
+			input: &openGraphFileConfig{
+				Enabled:      true,
+				ConsiderHost: false,
+				TimeToLive:   "1h",
+				Override:     map[string]string{},
+			},
+			err: nil,
+		},
+		{
+			name: "basic happy path with default",
+			input: &openGraphFileConfig{
+				Enabled:      true,
+				ConsiderHost: false,
+				TimeToLive:   "1h",
+				Override: map[string]string{
+					"og:title": "foobar",
+				},
+			},
+			err: nil,
+		},
+		{
+			name: "invalid time duration",
+			input: &openGraphFileConfig{
+				Enabled:      true,
+				ConsiderHost: false,
+				TimeToLive:   "taco",
+				Override:     map[string]string{},
+			},
+			err: ErrOpenGraphTTLDoesNotParse,
+		},
+		{
+			name: "missing og:title in defaults",
+			input: &openGraphFileConfig{
+				Enabled:      true,
+				ConsiderHost: false,
+				TimeToLive:   "1h",
+				Override: map[string]string{
+					"description": "foobar",
+				},
+			},
+			err: ErrOpenGraphMissingProperty,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.input.Valid(); !errors.Is(err, tt.err) {
+				t.Logf("wanted error: %v", tt.err)
+				t.Logf("got error:    %v", err)
+				t.Error("validation failed")
+			}
+		})
+	}
+}