v0.42.0: real Let's Encrypt cert via wildcard proactive issuance

traefik's websecure entrypoint now declares http.tls.domains *.<domain>+apex so
it proactively obtains the wildcard via Cloudflare DNS-01 at startup (cert ready
before first client, every router serves it by SNI). Gated on CFAPIToken (DNS-01).
TraefikData gains Domain; ensureTraefik wires cfg.Customer.Domain.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

controller/internal/infra/infra.go

@@ -40,8 +40,11 @@ type FileSpec struct {
 }
 
 // TraefikData is the per-customer input for the traefik stack. ACMEEmail empty → no Let's Encrypt
-// (traefik serves self-signed); CFAPIToken empty → HTTP-01 instead of Cloudflare DNS-01, and no .env.
+// (traefik serves self-signed); CFAPIToken empty → HTTP-01 instead of Cloudflare DNS-01, and no .env
+// (and no wildcard — HTTP-01 can't issue wildcards). Domain drives the wildcard proactive-issuance
+// SAN (`*.<Domain>` + apex) when DNS-01 is in use.
 type TraefikData struct {
+	Domain     string
 	ACMEEmail  string
 	CFAPIToken string
 }

controller/internal/infra/infra_test.go

@@ -25,9 +25,9 @@ func allRendered(t *testing.T) []string {
 	t.Helper()
 	var out []string
 	for _, td := range []TraefikData{
-		{ACMEEmail: "admin@example.com", CFAPIToken: "cf-api-tok"},
-		{ACMEEmail: "admin@example.com"}, // email, no CF token → HTTP-01
-		{},                               // token-less / LAN-only
+		{Domain: "example.com", ACMEEmail: "admin@example.com", CFAPIToken: "cf-api-tok"},
+		{Domain: "example.com", ACMEEmail: "admin@example.com"}, // email, no CF token → HTTP-01
+		{Domain: "example.com"},                                 // token-less / LAN-only
 	} {
 		files, err := RenderTraefik(td)
 		if err != nil {
@@ -64,7 +64,7 @@ func TestNoLatestTagSurvives(t *testing.T) {
 }
 
 func TestTraefikWithCloudflareToken(t *testing.T) {
-	files, err := RenderTraefik(TraefikData{ACMEEmail: "admin@example.com", CFAPIToken: "cf-api-tok"})
+	files, err := RenderTraefik(TraefikData{Domain: "example.com", ACMEEmail: "admin@example.com", CFAPIToken: "cf-api-tok"})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -75,6 +75,10 @@ func TestTraefikWithCloudflareToken(t *testing.T) {
 	if !strings.Contains(yml, "dnsChallenge") || !strings.Contains(yml, "provider: cloudflare") {
 		t.Error("expected Cloudflare DNS-01 challenge when CF API token set")
 	}
+	// Wildcard proactive issuance (DNS-01 path): the entrypoint must request *.<domain> + apex.
+	if !strings.Contains(yml, `main: "*.example.com"`) || !strings.Contains(yml, `- "example.com"`) {
+		t.Errorf("expected wildcard domains block (*.example.com + apex) on the DNS-01 path:\n%s", yml)
+	}
 	if strings.Contains(yml, "httpChallenge") {
 		t.Error("HTTP-01 must NOT appear when a CF API token is set")
 	}
@@ -117,6 +121,9 @@ func TestTraefikEmailNoCloudflareToken(t *testing.T) {
 	if strings.Contains(yml, "dnsChallenge") {
 		t.Error("DNS-01 must NOT appear without a CF token")
 	}
+	if strings.Contains(yml, "main: \"*.") {
+		t.Error("wildcard domains block must NOT appear on the HTTP-01 path (wildcards need DNS-01)")
+	}
 	if _, ok := files[".env"]; ok {
 		t.Error("no .env should be emitted without a CF API token")
 	}

controller/internal/infra/templates/traefik.yml.tmpl

@@ -19,6 +19,15 @@ entryPoints:
     http:
       tls:
         certResolver: letsencrypt
+{{- if .CFAPIToken}}
+        # Wildcard proactive issuance (DNS-01 only — HTTP-01 can't do wildcards): traefik obtains
+        # *.<domain> (+ apex) at startup, so every router serves the real cert by SNI match with no
+        # per-app labels and the cert is ready before the first client connects.
+        domains:
+          - main: "*.{{.Domain}}"
+            sans:
+              - "{{.Domain}}"
+{{- end}}
 {{- end}}
 
 providers:

controller/internal/stacks/infra.go

@@ -92,6 +92,7 @@ func (m *Manager) ensureTraefik(dir string) error {
 		return fmt.Errorf("chmod acme.json: %w", err)
 	}
 	files, err := infra.RenderTraefik(infra.TraefikData{
+		Domain:     m.cfg.Customer.Domain,
 		ACMEEmail:  m.cfg.Customer.Email,
 		CFAPIToken: m.cfg.Infrastructure.CFAPIToken,
 	})