Dockerfile: add ALPINE_VERSION build-arg

This allows us to pin to a specific version of Alpine, in case the
golang:alpine image switches to a newer version, which may at times
be incompatible, e.g. see moby/moby#44570

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 7b56eba)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -2,11 +2,12 @@
 
 ARG BASE_VARIANT=alpine
 ARG GO_VERSION=1.18.8
+ARG ALPINE_VERSION=3.16
 ARG XX_VERSION=1.1.0
 
 FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx
 
-FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-${BASE_VARIANT} AS build-base-alpine
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-${BASE_VARIANT}${ALPINE_VERSION} AS build-base-alpine
 COPY --from=xx / /
 RUN apk add --no-cache clang lld llvm file git
 WORKDIR /go/src/github.com/docker/cli

dockerfiles/Dockerfile.dev

@@ -1,8 +1,9 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.18.8
+ARG ALPINE_VERSION=3.16
 
-FROM golang:${GO_VERSION}-alpine AS golang
+FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golang
 ENV  CGO_ENABLED=0
 
 FROM golang AS esc

dockerfiles/Dockerfile.lint

@@ -1,9 +1,10 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.18.8
+ARG ALPINE_VERSION=3.16
 ARG GOLANGCI_LINT_VERSION=v1.45.2
 
-FROM    golang:${GO_VERSION}-alpine AS build
+FROM    golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS build
 ENV     CGO_ENABLED=0
 RUN     apk add --no-cache git
 ARG     GOLANGCI_LINT_VERSION
@@ -12,7 +13,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/go/pkg/mod \
         go install github.com/golangci/golangci-lint/cmd/golangci-lint@${GOLANGCI_LINT_VERSION}
 
-FROM    golang:${GO_VERSION}-alpine AS lint
+FROM    golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS lint
 ENV     GO111MODULE=off
 ENV     CGO_ENABLED=0
 ENV     DISABLE_WARN_OUTSIDE_CONTAINER=1