Simplify Dockerfile by removing dummy source file steps

Author: AbdelStark

Dockerfile

@@ -1,25 +1,13 @@
-FROM rust:1.76-slim as builder
+FROM rust:1.85-slim as builder
 
 WORKDIR /app
 
-# Copy the manifest files
-COPY Cargo.toml ./
-
-# Create a dummy source file to build dependencies
-RUN mkdir -p src && echo "fn main() {}" > src/main.rs
-
-# Build dependencies (this will be cached)
-RUN cargo build --release
-
-# Remove the dummy source file
-RUN rm -rf src
+# Copy Cargo files for dependency caching
+COPY Cargo.toml Cargo.lock* ./
 
 # Copy the actual source code
 COPY src ./src
 
-# Force a rebuild with the actual source code
-RUN touch src/main.rs
-
 # Build the application
 RUN cargo build --release