Add CI Docker image with Go 1.23 + Node 22 pre-installed, update workflow to use go-react label

ci-image/Dockerfile

@@ -0,0 +1,11 @@
+FROM catthehacker/ubuntu:act-latest
+
+# Install Go 1.23
+RUN curl -sL https://go.dev/dl/go1.23.6.linux-amd64.tar.gz | tar -C /usr/local -xz
+
+# Install Node 22
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && apt-get install -y nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV PATH="/usr/local/go/bin:${PATH}"