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

internal/classify/supabase.go

@@ -0,0 +1,45 @@
+package classify
+
+import "tea.karlcom.de/karl/bucketeer/internal/model"
+
+// classifySupabase handles <project-ref>.supabase.co and
+// db.<project-ref>.supabase.co (the latter classified as PostgreSQL).
+func classifySupabase(s *scanner) (model.Match, bool) {
+	n := s.n
+	if s.label(n-1) != "co" || s.label(n-2) != "supabase" {
+		return model.Match{}, false
+	}
+	switch n {
+	case 3:
+		return model.Match{
+			Provider:         model.ProviderSupabase,
+			Service:          model.ServiceDatabase,
+			ResourceSpecific: true,
+			Resource:         s.label(0),
+		}, true
+	case 4:
+		if s.label(0) == "db" {
+			return model.Match{
+				Provider:         model.ProviderSupabase,
+				Service:          model.ServicePostgres,
+				ResourceSpecific: true,
+				Resource:         s.label(1),
+			}, true
+		}
+	}
+	return model.Match{}, false
+}
+
+// classifySupabasePooler handles aws-<index>-<region>.pooler.supabase.com.
+func classifySupabasePooler(s *scanner) (model.Match, bool) {
+	n := s.n
+	if n != 4 || s.label(n-1) != "com" || s.label(n-2) != "supabase" || s.label(n-3) != "pooler" {
+		return model.Match{}, false
+	}
+	return model.Match{
+		Provider:         model.ProviderSupabase,
+		Service:          model.ServicePostgres,
+		ResourceSpecific: true,
+		Resource:         s.label(0),
+	}, true
+}