common/container: move masterdir image building to void-packages

see void-linux/void-docker#11

common/container/Containerfile

@@ -0,0 +1,35 @@
+# syntax=docker/dockerfile:1
+FROM --platform=${BUILDPLATFORM} alpine:3.18 AS bootstrap
+ARG TARGETPLATFORM
+ARG MIRROR=https://repo-ci.voidlinux.org
+ARG LIBC
+RUN apk add ca-certificates curl && \
+  curl "${MIRROR}/static/xbps-static-static-0.59_5.$(uname -m)-musl.tar.xz" | tar vJx
+COPY common/repo-keys/* /target/var/db/xbps/keys/
+COPY common/container/setup.sh /bootstrap/setup.sh
+RUN --mount=type=cache,sharing=locked,target=/target/var/cache/xbps,id=repocache-${LIBC} \
+  . /bootstrap/setup.sh; \
+  XBPS_TARGET_ARCH=${ARCH} xbps-install -S \
+    -R "${REPO}" -R "${REPO}/bootstrap" \
+    -r /target
+
+FROM --platform=${BUILDPLATFORM} bootstrap AS install
+ARG TARGETPLATFORM
+ARG MIRROR
+ARG LIBC
+COPY --from=bootstrap /target /target
+COPY common/container/noextract.conf /target/etc/xbps.d/noextract.conf
+RUN --mount=type=cache,sharing=locked,target=/target/var/cache/xbps,id=repocache-${LIBC} \
+  . /bootstrap/setup.sh; \
+  XBPS_TARGET_ARCH=${ARCH} xbps-install -y \
+    -R "${REPO}" -R "${REPO}/bootstrap" \
+    -r /target \
+    base-chroot void-repo-bootstrap
+
+FROM scratch AS image
+COPY --link --from=install /target /
+RUN \
+  install -dm1777 tmp; \
+  xbps-reconfigure -fa; \
+  rm -rf /var/cache/xbps/*
+CMD ["/bin/sh"]

common/container/docker-bake.hcl

@@ -0,0 +1,29 @@
+variable "MIRROR" {
+  default = "https://repo-ci.voidlinux.org/"
+}
+
+target "docker-metadata-action" {}
+
+target "_common" {
+  inherits = ["docker-metadata-action"]
+  dockerfile = "common/container/Containerfile"
+  no-cache-filter = ["bootstrap"]
+  cache-to = ["type=local,dest=/tmp/buildx-cache"]
+  cache-from = ["type=local,src=/tmp/buildx-cache"]
+  target = "image"
+  args = {
+    "MIRROR" = "${MIRROR}"
+  }
+}
+
+target "void-buildroot-glibc" {
+  inherits = ["_common"]
+  platforms = ["linux/amd64", "linux/386", "linux/arm64", "linux/arm/v7", "linux/arm/v6"]
+  args = { "LIBC" = "glibc" }
+}
+
+target "void-buildroot-musl" {
+  inherits = ["_common"]
+  platforms = ["linux/amd64", "linux/arm64", "linux/arm/v7", "linux/arm/v6"]
+  args = { "LIBC" = "musl" }
+}

common/container/noextract.conf

@@ -0,0 +1,13 @@
+noextract=/etc/sv*
+noextract=/usr/share/man*
+noextract=/usr/lib/dracut*
+noextract=/etc/skel*
+noextract=/usr/lib/modprobe.d*
+noextract=/usr/lib/sysctl.d*
+noextract=/usr/lib/udev*
+noextract=/usr/share/bash-completion*
+noextract=/usr/share/fish/vendor-completions.d*
+noextract=/usr/share/zsh/site-functions*
+noextract=/usr/share/info*
+noextract=/usr/share/locale*
+noextract=/usr/lib/gconv*

common/container/setup.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+: "${MIRROR:=https://repo-default.voidlinux.org/}"
+
+suffix() {
+	case "${LIBC:?}" in
+	musl) echo "-musl" ;;
+	esac
+}
+
+repo() {
+	case "${ARCH:?}" in
+	aarch64*) echo "${MIRROR}/current/aarch64" ;;
+	*-musl)   echo "${MIRROR}/current/musl"    ;;
+	*)        echo "${MIRROR}/current"         ;;
+	esac
+}
+
+case "${TARGETPLATFORM:?}" in
+linux/arm/v6) ARCH="armv6l$(suffix)"  ;;
+linux/arm/v7) ARCH="armv7l$(suffix)"  ;;
+linux/arm64)  ARCH="aarch64$(suffix)" ;;
+linux/amd64)  ARCH="x86_64$(suffix)"  ;;
+linux/386)    ARCH="i686$(suffix)"    ;;
+esac
+
+REPO="$(repo)"
+
+export ARCH REPO