enhancement: Update Dockerfile for web service to use Alpine Linux as base image and improve metadata

Author: lmcdonough

web/Dockerfile

@@ -4,21 +4,43 @@ FROM rust:1.55 AS builder
 # Set the working directory
 WORKDIR /usr/src/app
 
-# Copy the Cargo.toml and Cargo.lock files to the working directory
-COPY . .
+# Copy Cargo.toml and Cargo.lock and install dependencies
+COPY Cargo.toml Cargo.lock ./
+RUN cargo fetch
 
-# Build the Rust Frontend Service
+# Copy the rest of the code and build the application
+COPY . .
 RUN cargo build --release
 
 
 # Stage 2: Create a smaller image with only the build binary
-FROM debian:buster-slim
+FROM alpine:3.14
+
+# Add metadata
+LABEL maintainer="Levi McDonough <levimcdonough@gmail.com>"
+LABEL version="1.0"
+LABEL description="The web service for the refactor platoform project."
+
+# Install necessary runtime dependencies
+RUN apk add --no-cache ca-certificates
+
+# Create a non-root user and group
+RUN addgroup -S appgroup && adduser -S refactoruser -G refactorgroup
+
+# Set the working directory
+WORKDIR /app
 
 # Copy the binary from the build stage to the working directory
-COPY --from=builder /usr/src/app/target/release/app /usr/local/bin/app
+COPY --from=builer /usr/src/app/target/release/app .
 
-# Expose the port that the application listens on
+# Change ownership of the binary to the non-root user
+RUN chown refactoruser:refactorgroup /app/app
+
+# Expose the port that the app listens on
 EXPOSE 8000
 
+# Switch to the non-root user
+USER  refactoruser
+
 # Set the command to run the application
-CMD ["app"]
+CMD ["./app"]