Add the runnable Gitea, PostgreSQL, and Hop control-plane foundation

Hop-State: A_06FN3QYA1N56NQYGZ81DWGR
Hop-Proposal: R_06FN3QXJRYPPEQZQA6S69QG
Hop-Task: T_06FN3MVGY3MT82ESQ89BND0
Hop-Attempt: AT_06FN3MVGY092BFA5MR9C7EG

services/control-plane/internal/config/config_test.go

@@ -0,0 +1,27 @@
+package config
+
+import "testing"
+
+func TestLoadRequiresSecretsAndDatabase(t *testing.T) {
+	t.Setenv("HOP_DATABASE_URL", "")
+	t.Setenv("HOP_ADMIN_TOKEN", "")
+	t.Setenv("HOP_GITEA_WEBHOOK_SECRET", "")
+	if _, err := Load(); err == nil {
+		t.Fatal("expected missing configuration error")
+	}
+}
+
+func TestLoadDefaults(t *testing.T) {
+	t.Setenv("HOP_DATABASE_URL", "postgres://example")
+	t.Setenv("HOP_ADMIN_TOKEN", "admin-token-long-enough")
+	t.Setenv("HOP_GITEA_WEBHOOK_SECRET", "webhook-secret-long-enough")
+	t.Setenv("HOP_HTTP_ADDR", "")
+	t.Setenv("GITEA_BASE_URL", "")
+	cfg, err := Load()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.HTTPAddr != ":8080" || cfg.GiteaBaseURL != "http://localhost:3000" {
+		t.Fatalf("unexpected defaults: %#v", cfg)
+	}
+}