Refactor Docker setup and update API description

- Updated docker-compose.yml to use context and dockerfile for the app service, and removed unnecessary db service configuration.
- Modified Dockerfile to use the official Rust nightly image and streamlined the build process with updated working directories and runtime dependencies.
- Changed API description in root handler to reflect the correct endpoint for fetching the current hospital.

Dockerfile

@@ -1,33 +1,35 @@
-FROM rust:1.76-slim-bullseye as builder
+# Use the official Rust nightly image as a build environment
+FROM rustlang/rust:nightly-slim as builder
 
-WORKDIR /usr/src/app
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create a new empty shell project
+WORKDIR /usr/src/hospitalapi
+
+# Copy the source code
 COPY . .
 
 # Build the application
 RUN cargo build --release
 
-# Create a new stage with a minimal image
-FROM debian:bullseye-slim
+# Use a minimal runtime image
+FROM debian:bookworm-slim
 
-WORKDIR /usr/local/bin
-
-# Install necessary runtime dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y \
     ca-certificates \
+    libssl3 \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy the built binary from the builder stage
-COPY --from=builder /usr/src/app/target/release/hospitalapi .
+# Copy the binary from the builder stage
+COPY --from=builder /usr/src/hospitalapi/target/release/hospitalapi /usr/local/bin/hospitalapi
 
-# Create a directory for the .env file
-RUN mkdir -p /usr/src/app
-WORKDIR /usr/src/app
-
-# Copy the .env file
-COPY .env .
-
-# Expose the port the app runs on
-EXPOSE 3000
+# Set the working directory
+WORKDIR /usr/local/bin
 
 # Run the application
-CMD ["./hospitalapi"] 
+CMD ["hospitalapi"]