ci: smoke-test image without binding a host port

.gitea/workflows/ci.yml

@@ -70,12 +70,24 @@ jobs:
         run: |
           image="$(printf '%s\n' "$PUBLISHED_TAGS" | head -n 1)"
           docker pull "$image"
-          docker run -d --rm -p 3000:3000 --name budget2-ci "$image"
+          docker run -d --rm --name budget2-ci "$image"
           trap 'docker stop budget2-ci' EXIT
-          for i in $(seq 1 30); do
-            if curl -fsS http://localhost:3000/ > /dev/null; then break; fi
-            sleep 1
-          done
-          curl -fsS http://localhost:3000/ | grep -q "Budget"
-          curl -fsS http://localhost:3000/sw.js > /dev/null
-          curl -fsS http://localhost:3000/manifest.webmanifest > /dev/null
+          docker exec budget2-ci bun -e '
+            const base = "http://127.0.0.1:3000";
+            let ready = false;
+            for (let attempt = 0; attempt < 30; attempt++) {
+              try {
+                const response = await fetch(base + "/");
+                if (response.ok && (await response.text()).includes("Budget")) {
+                  ready = true;
+                  break;
+                }
+              } catch {}
+              await Bun.sleep(1000);
+            }
+            if (!ready) throw new Error("App did not serve its HTML");
+            for (const path of ["/sw.js", "/manifest.webmanifest"]) {
+              const response = await fetch(base + path);
+              if (!response.ok) throw new Error(`${path} returned ${response.status}`);
+            }
+          '