Update Dockerfile to use golang:1.17

Author: sergiught

01-Authorization-RS256/Dockerfile

@@ -1,16 +1,23 @@
-FROM golang:1.8-alpine3.6
+FROM golang:1.17-alpine3.14
 
-# install git
+# Install git
 RUN apk --update add \
 	git openssl \
 	&& rm /var/cache/apk/*
 
-WORKDIR /go/src
+# Define current working directory
+WORKDIR /01-Authorization-RS256
 
-ADD . /go/src
+# Download modules to local cache so we can skip re-
+# downloading on consecutive docker build commands
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
 
-RUN go-wrapper download
-
-CMD ["go", "run", "main.go"]
+# Add sources
+COPY . .
 
+# Expose port 3010 for our api binary
 EXPOSE 3010
+
+CMD ["go", "run", "main.go"]