chore: tweak assets cache

Author: johnnyjoygh

public/_headers

@@ -31,3 +31,6 @@
 
 /content/*
   Cache-Control: public,max-age=604800,stale-while-revalidate=604800
+
+/home/*
+  Cache-Control: public,max-age=604800,stale-while-revalidate=604800

scripts/smoke-test.mjs

@@ -33,6 +33,12 @@ const checks = [
   { path: "/api/search", type: "search-index" },
   { path: "/sitemap.xml", type: "text", contains: "<urlset" },
   { path: "/blog/feed.xml", type: "text", contains: "<rss" },
+  {
+    path: "/home/golden-hour-trail.png",
+    type: "png",
+    cacheControlIncludes: "public,max-age=604800,stale-while-revalidate=604800",
+    openNextCacheAbsent: true,
+  },
   {
     path: "/apple-touch-icon.png",
     type: "png",

scripts/static-headers.test.mjs

@@ -74,6 +74,12 @@ test("generated homepage Open Graph image keeps its cache rule", async () => {
   assert.equal(headers.get("cache-control"), "public,max-age=86400,stale-while-revalidate=604800");
 });
 
+test("homepage images stay fresh for one week", async () => {
+  const headers = await readEffectiveHeaders("/home/golden-hour-trail.png");
+
+  assert.equal(headers.get("cache-control"), "public,max-age=604800,stale-while-revalidate=604800");
+});
+
 test("generated homepage Open Graph image allows cross-origin reads", async () => {
   const headers = await readEffectiveHeaders("/og/home/image.png");