Dockerfile: update ALPINE_VERSION to 3.18

This also moves `musl-dev` to the alpine-base stage, due to changes in
Alpine 3.18 causing gotestsum build to fail because stdlib.h was missing;

    docker#17 5.065 # runtime/cgo
    docker#17 5.065 In file included from _cgo_export.c:3:
    docker#17 5.065 /usr/include/fortify/stdlib.h:23:15: fatal error: stdlib.h: No such file or directory
    docker#17 5.065    23 | #include_next <stdlib.h>
    docker#17 5.065       |               ^~~~~~~~~~

alpine 3.17:

    / # find / | grep stdlib.h
    /usr/include/c++/12.2.1/tr1/stdlib.h
    /usr/include/c++/12.2.1/stdlib.h

alpine 3.18

    / # find / | grep stdlib.h
    /usr/lib/llvm16/lib/clang/16/include/__clang_hip_stdlib.h
    /usr/include/fortify/stdlib.h
    /usr/include/c++/12.2.1/tr1/stdlib.h
    /usr/include/c++/12.2.1/stdlib.h

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG BASE_VARIANT=alpine
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 ARG BASE_DEBIAN_DISTRO=bookworm
 
 ARG GO_VERSION=1.21.3

dockerfiles/Dockerfile.authors

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 
 FROM alpine:${ALPINE_VERSION} AS gen
 RUN apk add --no-cache bash git

dockerfiles/Dockerfile.dev

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.21.3
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 
 ARG BUILDX_VERSION=0.12.0
 FROM docker/buildx-bin:${BUILDX_VERSION} AS buildx

dockerfiles/Dockerfile.lint

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.21.3
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 ARG GOLANGCI_LINT_VERSION=v1.55.2
 
 FROM golangci/golangci-lint:${GOLANGCI_LINT_VERSION}-alpine AS golangci-lint

dockerfiles/Dockerfile.vendor

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.21.3
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 ARG MODOUTDATED_VERSION=v0.8.0
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base