Update to Go 1.23, address Dockerfile warnings and reorder operations…

… for build cache

Dockerfile

@@ -1,30 +1,29 @@
-FROM --platform=$TARGETPLATFORM golang:1.19-alpine as go
-ARG TARGETPLATFORM
+FROM golang:1.23-alpine AS go
 ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+WORKDIR /workdir
 
 RUN echo "Running on ${BUILDPLATFORM}, building for ${TARGETPLATFORM}."
+RUN apk add git build-base
+RUN go env -w GOPROXY=direct
 
-WORKDIR /workdir
 COPY go.mod .
 COPY go.sum .
 
-RUN apk add git build-base
-RUN go env -w GOPROXY=direct
 RUN go mod download -x
 
 COPY . .
 
 RUN go build -v -o _output/secrets-store-csi-driver-provider-aws
 
-FROM --platform=$TARGETPLATFORM public.ecr.aws/amazonlinux/amazonlinux:2 as al2
-ARG TARGETPLATFORM
+FROM public.ecr.aws/amazonlinux/amazonlinux:2 AS al2
 
 FROM scratch
 
-COPY --from=go  /workdir/_output/secrets-store-csi-driver-provider-aws /bin/secrets-store-csi-driver-provider-aws
-
 # Copy current certificates from AL2 (/etc/pki/ symlinked in /etc/ssl/certs/)
 COPY --from=al2 /etc/pki/ /etc/pki/
 COPY --from=al2 /etc/ssl/certs/ /etc/ssl/certs
 
+COPY --from=go  /workdir/_output/secrets-store-csi-driver-provider-aws /bin/secrets-store-csi-driver-provider-aws
+
 ENTRYPOINT ["/bin/secrets-store-csi-driver-provider-aws"]