Bump go requirements to 1.24, refactor leadership, fixing k8s code to support latest versions, tests on github actions

examples/kubernetes/image/docker/Dockerfile → .github/Dockerfile

@@ -1,20 +1,12 @@
-ARG PGVERSION
-
-# base build image
-FROM golang:1.16-buster AS build_base
-
-WORKDIR /stolon
-
-# only copy go.mod and go.sum
-COPY go.mod .
-COPY go.sum .
-
-RUN go mod download
+ARG PGVERSION=0
+ARG ARCHITECTURE=amd64
 
 #######
 ####### Build the stolon binaries
 #######
-FROM build_base AS builder
+FROM golang:1.24-bookworm AS builder
+
+WORKDIR /stolon
 
 # copy all the sources
 COPY . .
@@ -24,13 +16,12 @@ RUN make
 #######
 ####### Build the final image
 #######
-FROM postgres:$PGVERSION
+FROM postgres:${PGVERSION}
 
 RUN useradd -ms /bin/bash stolon
 
 EXPOSE 5432
 
-# copy the agola-web dist
 COPY --from=builder /stolon/bin/ /usr/local/bin
 
 RUN chmod +x /usr/local/bin/stolon-keeper /usr/local/bin/stolon-sentinel /usr/local/bin/stolon-proxy /usr/local/bin/stolonctl