Tighten automatic upstream version tracking

.github/docker/Dockerfile.arm64

@@ -1,6 +1,6 @@
 FROM ubuntu:24.04
 
-ARG TRIANGLES_VERSION=v5.5.0
+ARG TRIANGLES_VERSION=v5.7.6
 
 RUN apt-get update && apt-get install -y \
     git build-essential libtool autotools-dev automake pkg-config \

bootstrap.sh

@@ -32,8 +32,8 @@ echo "✓ ARM64 detected"
 echo "🔍 Checking latest release..."
 VERSION=$(curl -sL https://api.github.com/repos/SamiAhmed7777/tri-pi/releases/latest | grep '"tag_name"' | cut -d'"' -f4)
 if [ -z "$VERSION" ]; then
-    echo "⚠️  Could not detect latest version, using v5.5.0"
-    VERSION="v5.5.0"
+    echo "⚠️  Could not detect latest version"
+    exit 1
 fi
 echo "   Latest: $VERSION"