[MOD] Upgrade go version to 1.20

Dockerfile

@@ -1,5 +1,5 @@
 # Create base builder image
-FROM golang:1.18.10-alpine3.17 AS builder
+FROM golang:1.20-alpine AS builder
 WORKDIR /go/src/github.com/chain4travel/camino-signavault
 RUN apk add --no-cache alpine-sdk bash git make gcc musl-dev linux-headers git ca-certificates g++ libstdc++
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/chain4travel/camino-signavault
 
-go 1.18
+go 1.20
 
 require (
 	github.com/ava-labs/avalanchego v1.9.4-rc.7

scripts/build.sh

@@ -9,4 +9,10 @@ OUTPUT="signavault"
 
 echo "Building signavault..."
 go build -o "$OUTPUT" cmd/camino-signavault/main.go
-echo "SUCCESS"
+if [[ -f "$OUTPUT" ]]; then
+    echo "Build Successful"
+    exit 0
+else
+    echo "Build failure" >&2
+    exit 1
+fi