Fix Docker deployment inputs

Include all addon workspaces and vendored dependencies in image builds, and expose deploy time plus commit metadata on the home page.

Amp-Thread-ID: https://ampcode.com/threads/T-01a033d4-0e44-708e-af0e-6166283416ff
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

server/app_test.go

@@ -68,6 +68,25 @@ func TestHealth(t *testing.T) {
 	}
 }
 
+func TestHomeLogsDeploymentMetadata(t *testing.T) {
+	t.Setenv("YAWN_DEPLOYED_AT", "2026-08-24T18:30:00Z")
+	t.Setenv("YAWN_DEPLOY_COMMIT_MESSAGE", "Fix Docker deployment")
+	request := httptest.NewRequest(http.MethodGet, "/", nil)
+	response := httptest.NewRecorder()
+	testApplication(t).routes().ServeHTTP(response, request)
+	if response.Code != http.StatusOK {
+		t.Fatalf("status = %d", response.Code)
+	}
+	for _, expected := range []string{
+		`console.log("Yawn deployed at 25 August 2026, 12:00:00 AM IST\nLatest commit: Fix Docker deployment")`,
+		"<title>Yawn",
+	} {
+		if !bytes.Contains(response.Body.Bytes(), []byte(expected)) {
+			t.Fatalf("home page does not contain %q", expected)
+		}
+	}
+}
+
 func TestPlaygroundStoreMigratesLoadouts(t *testing.T) {
 	path := filepath.Join(t.TempDir(), "legacy.db")
 	database, err := sql.Open("sqlite3", path)