Update Go build environment

Author: Tom Downes

Dockerfile

@@ -1,12 +1,12 @@
-FROM golang:1.18-alpine as build
+FROM golang:1.24-alpine as build
 
 RUN apk add --no-cache ca-certificates git
 WORKDIR $GOPATH/src/github.com/contentful-labs/terraform-diff
 
 COPY . ./
 RUN CGO_ENABLED=0 GOOS=linux go build -mod=vendor -a -tags netgo -ldflags '-w' .
 
-FROM alpine:3.17
+FROM alpine:3.22
 RUN apk add --no-cache git
 COPY --from=build /go/src/github.com/contentful-labs/terraform-diff/terraform-diff terraform-diff
 RUN git config --global --add safe.directory '*'