upgrade Go from 1.23.4 to 1.25.0 (#2945)

* upgrade go to 1.25
* add minor version to be Go 1.25.0
* revert the Go version on README to keep the history of the release

docker/DebugDockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23-alpine
+FROM golang:1.25-alpine
 LABEL maintainer="Team ACID @ Zalando <team-acid@zalando.de>"
 
 # We need root certificates to deal with teams api over https

docker/Dockerfile

@@ -1,5 +1,5 @@
 ARG BASE_IMAGE=registry.opensource.zalan.do/library/alpine-3:latest
-FROM golang:1.23-alpine AS builder
+FROM golang:1.25-alpine AS builder
 ARG VERSION=latest
 
 COPY  . /go/src/github.com/zalando/postgres-operator

docker/build_operator.sh

@@ -13,7 +13,7 @@ apt-get install -y wget
 
 (
     cd /tmp
-    wget -q "https://storage.googleapis.com/golang/go1.23.4.linux-${arch}.tar.gz" -O go.tar.gz
+    wget -q "https://storage.googleapis.com/golang/go1.25.0.linux-${arch}.tar.gz" -O go.tar.gz
     tar -xf go.tar.gz
     mv go /usr/local
     ln -s /usr/local/go/bin/go /usr/bin/go