Fix cypress:local: Skip test for cache control header

The cache control header in netlify dev does not include "public" for
static assets. This is unlike netlify.app. We should probably set
headers in a _headers file as suggested by:
#110

For now, we simply skip the test when running the Cypress tests locally.

Author: FinnWoelm

cypress/integration/optionalCatchAll_at_root_spec.js

@@ -104,9 +104,11 @@ describe("pre-rendered pages: /subfolder/[id].js", () => {
   });
 
   it("serves the pre-rendered HTML (and not the Netlify Function)", () => {
-    cy.request("/subfolder/static").then((response) => {
-      expect(response.headers["cache-control"]).to.include("public");
-    });
+    if (Cypress.env("DEPLOY") !== "local") {
+      cy.request("/subfolder/static").then((response) => {
+        expect(response.headers["cache-control"]).to.include("public");
+      });
+    }
   });
 });