test(osiris): test osiris features and ensure it works

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/osiris/internal/entrypoint/testdata/good/selfsigned.hcl

@@ -0,0 +1,15 @@
+bind {
+  http    = ":65530"
+  https   = ":65531"
+  metrics = ":65532"
+}
+
+domain "osiris.local.cetacean.club" {
+  tls {
+    cert = "./testdata/selfsigned.crt"
+    key  = "./testdata/selfsigned.key"
+  }
+
+  target        = "http://localhost:3000"
+  health_target = "http://localhost:9091/healthz"
+}