Added missing cabal-update steps

Dockerfile

@@ -1,30 +0,0 @@
-FROM haskell:9.10
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y \
-    git \
-    curl \
-    && rm -rf /var/lib/apt/lists/*
-
-# Install Node.js (for GitHub Actions compatibility)
-RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
-    apt-get install -y nodejs && \
-    rm -rf /var/lib/apt/lists/*
-
-# Update cabal and install Haskell tools
-RUN cabal update && \
-    cabal install --install-method=copy --installdir=/usr/local/bin \
-    fourmolu \
-    hlint \
-    cabal-gild
-
-# Verify installations
-RUN ghc --version && \
-    cabal --version && \
-    node --version && \
-    fourmolu --version && \
-    hlint --version && \
-    cabal-gild --version
-
-# Set working directory
-WORKDIR /workspace