ctcloud: CertSpotter-backed CT cloud-resource monitor

Single stateless Go process that consumes CT logs via embedded (patched)
CertSpotter internals, classifies cloud/database/storage DNS identifiers
in-process with a zero-allocation classifier, enriches via round-robin DNS
resolvers with CNAME following, and batch-writes useful findings to PostgreSQL.

- third_party/certspotter: 2-hunk IdentifierSink patch, no stdout/JSON/files
- internal/classify: AWS/Azure/GCP/Firebase/Cloudflare R2/DigitalOcean/Supabase/OCI
- internal/dns: sharded bounded TTL cache, multi-resolver load balancing + failover
- internal/pipeline: bounded queues, dedup, direct-priority load shedding
- internal/store: pgx batch writer, Postgres CT checkpoints (no cert contents)
- internal/probe: optional non-destructive reachability checks (off by default)
- Docker: distroless non-root, read-only rootfs, no app volume, resource limits
- tests enforce 0 allocs/op on the classifier and sink hot path

third_party/certspotter/loglist/helpers.go

@@ -0,0 +1,40 @@
+// Copyright (C) 2020 Opsmate, Inc.
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License, v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+//
+// This software is distributed WITHOUT A WARRANTY OF ANY KIND.
+// See the Mozilla Public License for details.
+
+package loglist
+
+import (
+	"time"
+)
+
+// Return all tiled and non-tiled logs from all operators
+func (list *List) AllLogs() []*Log {
+	logs := []*Log{}
+	for operator := range list.Operators {
+		for log := range list.Operators[operator].Logs {
+			logs = append(logs, &list.Operators[operator].Logs[log])
+		}
+		for log := range list.Operators[operator].TiledLogs {
+			logs = append(logs, &list.Operators[operator].TiledLogs[log])
+		}
+	}
+	return logs
+}
+
+func (log *Log) LogIDString() string {
+	return log.LogID.Base64String()
+}
+
+func (log *Log) AcceptsExpiration(expiration time.Time) bool {
+	return log.TemporalInterval == nil || withinInterval(expiration, log.TemporalInterval.StartInclusive, log.TemporalInterval.EndExclusive)
+}
+
+func withinInterval(expiration, startInclusive, endExclusive time.Time) bool {
+	return !expiration.Before(startInclusive) && expiration.Before(endExclusive)
+}