Update Dockerfile

Dockerfile

@@ -1,8 +1,7 @@
-
 # ── Stage 1: Builder ─────────────────────────────────────────
 FROM ubuntu:22.04 AS builder
 
-# Install C++ build tools, CMake, Boost, OpenSSL, and nlohmann_json
+# Install all required C++ build tools and libraries
 RUN apt-get update && apt-get install -y \
     build-essential \
     cmake \
@@ -19,7 +18,6 @@ WORKDIR /app
 COPY . .
 
 # Configure and build the C++ project
-# This assumes your CMakeLists.txt is set up correctly in the root
 RUN cmake -B build -S . -DCMAKE_BUILD_TYPE=Release
 RUN cmake --build build -j$(nproc)
 
@@ -32,8 +30,9 @@ RUN useradd -m -u 1000 appuser
 WORKDIR /app
 
 # Copy the compiled binary from the builder stage
-# IMPORTANT: Replace "YOUR_EXECUTABLE_NAME" with the actual target name from your CMakeLists.txt
-COPY --from=builder --chown=appuser:appuser /app/build/collab_docs ./app_server
+# FIXED: The executable is 'collabdocs', not 'collab_docs'
+COPY --from=builder --chown=appuser:appuser /app/build/collabdocs ./app_server
+
 # Copy your frontend file so the C++ server can serve it
 COPY --chown=appuser:appuser index.html .