chore(security): accept CVE-2026-32280 in .trivyignore (#548)

Go stdlib crypto/x509 certificate chain building DoS affects Docker CLI
29.4.0 (Go 1.26.1) and Compose v5.1.2 (Go 1.25.8). Fix requires Go
1.25.9 or 1.26.2; no upstream static binary ships a patched runtime yet.
Not exploitable in our usage since the CLI and compose plugin connect to
the local Docker socket or registries with well-known CAs.

.trivyignore

@@ -23,7 +23,7 @@
 # Bundled inside /usr/local/bin/docker and docker-compose
 # ---------------------------------------------------------------------------
 # Docker CLI 29.4.0 ships Go 1.26.1 and Compose v5.1.2 ships Go 1.25.8.
-# Both are vulnerable to CVE-2026-32282 (fix requires Go 1.25.9 or 1.26.2).
+# Both Go versions are vulnerable (fix requires Go 1.25.9 or 1.26.2).
 # No upstream static binary ships a patched Go runtime yet. Revisit on the
 # next Docker CLI and Compose release.
 
@@ -35,6 +35,14 @@
 # release.
 CVE-2026-32282
 
+# Justification: Go stdlib crypto/x509 certificate chain building DoS.
+# Affects the same Go 1.26.1 (CLI) and 1.25.8 (Compose) runtimes as above.
+# The Docker CLI and compose plugin do not perform x509 chain validation
+# against untrusted certificates in our usage (they connect to the local
+# Docker socket or to registries with well-known CAs). Blocked on upstream
+# Go rebuild; revisit on next CLI/Compose release.
+CVE-2026-32280
+
 # ---------------------------------------------------------------------------
 # Bundled inside /usr/local/lib/docker/cli-plugins/docker-compose (v5.1.2)
 # ---------------------------------------------------------------------------