Update pool price docker file and ioutil->io in main.go

Dockerfile.price

@@ -1,6 +1,15 @@
 # Use the official Go image as the base image
 FROM golang:alpine AS build-stage
 
+# Install necessary packages (OpenSSL and ca-certificates)
+RUN apk --no-cache add openssl ca-certificates
+
+# Fetch the server certificate and store it
+RUN echo "Fetching server certificate..." \
+    && openssl s_client -showcerts -connect www.aeso.ca:443 </dev/null 2>/dev/null | \
+    awk '/-----BEGIN CERTIFICATE-----/,/-----END CERTIFICATE-----/{print}' > /usr/local/share/ca-certificates/server.crt \
+    && update-ca-certificates
+
 # Set the working directory inside the container
 WORKDIR /app
 
@@ -10,16 +19,23 @@ COPY poolprice/ .
 # Build the Go application
 RUN go build -o main .
 
-# Final stage
+# Final stage (minimal image with only the Go binary and certificates)
 FROM golang:alpine
 
 WORKDIR /app
 
 # Copy only the built binary from the build stage
 COPY --from=build-stage /app/main .
 
+# Copy the certificates from the build stage to the final stage
+COPY --from=build-stage /etc/ssl/certs /etc/ssl/certs
+COPY --from=build-stage /usr/local/share/ca-certificates /usr/local/share/ca-certificates
+
+# Ensure all certificates are up to date in the final stage
+RUN update-ca-certificates
+
 # Expose the port that the application will run on
 EXPOSE 8080
 
 # Command to run the executable
-CMD ["./main"]
+CMD ["./main"]

poolprice/main.go

@@ -3,7 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"time"
@@ -43,7 +43,7 @@ func getCurrentPoolPrice() {
 	defer resp.Body.Close()
 
 	if resp.StatusCode == http.StatusOK {
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			log.Fatal("Error reading response body:", err)
 		}