Dockerfile, Error handling, comments, docker-compose (#2)

dockerfile

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+# Build stage
+FROM golang:1.18 AS build
+
+WORKDIR /app
+
+# Install required dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the source code
+COPY . .
+
+# Build the executable with CGO disabled
+RUN CGO_ENABLED=0 go build -o bin/main src/*.go
+RUN mv config.example.yml ./bin/config.yml
+
+
+#######################
+# Test stage
+FROM build as test
+RUN go test -v ./... 
+
+
+#######################
+# Runtime stage
+
+FROM gcr.io/distroless/base
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the binary from the build stage
+COPY --from=build /app/bin/main  /app/main
+COPY --from=build /app/bin/config.yml  /app/config.yml
+
+# Expose the port the app runs on (replace with your desired port)
+EXPOSE 3001
+
+# Run the app
+CMD ["./main"]