ci: build and publish the apk from this repo

A package workflow on the pmos runner: pmbootstrap cross-builds the
aarch64 apk(s) from packaging/aport/ at the pushed commit and uploads
them to the Forgejo Alpine registry, so a daemon release reaches
installed phones via plain 'apk upgrade' without an fp6-img image run.
Releases are gated by pkgver: the registry 409s an already-published
version and the workflow moves on, so ordinary pushes are no-ops until
the aport bumps pkgver/pkgrel.

fp6-img is unchanged: images still build imsd from a pinned checkout of
this repo, from the same aport.

Needs the PACKAGE_TOKEN secret on this repo (or org-wide) to publish;
until then the workflow builds and skips the upload.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packaging/build-package.sh

@@ -0,0 +1,115 @@
+#!/bin/sh -eu
+# SPDX-License-Identifier: GPL-3.0-only
+# SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
+# CI package build: produce the imsd apk(s) for aarch64 from THIS checkout,
+# using packaging/aport/ (the canonical aport) and pmbootstrap's cross
+# chroots. Runs in CI inside an Alpine container on the privileged "pmos"
+# runner (qemu-user binfmt on the host for the aarch64 chroots); also
+# runnable in any Alpine environment with the same privileges
+# (IMSD_NO_CROSSDIRECT=1 for hosts where crossdirect's /native bridge
+# breaks — the build then runs qemu-only, slower, identical output).
+#
+# Built packages land in ~build/.local/var/pmbootstrap/packages/*/aarch64/;
+# the workflow's publish step uploads the imsd*.apk ones to the Forgejo
+# Alpine registry.
+
+set -eu
+
+PMAPORTS_REPO=https://gitlab.postmarketos.org/postmarketOS/pmaports.git
+SRC=$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)
+
+# pmbootstrap refuses to run as root: install deps, then re-exec as a build
+# user with passwordless sudo (pmbootstrap escalates itself where needed).
+if [ "$(id -u)" = 0 ]; then
+	apk add -q git sudo python3 py3-pip multipath-tools util-linux tar
+	# pmbootstrap pinned from git: Alpine's package is older. The pmOS
+	# gitlab hiccups under crawler load; a failure costs a retry, not the run
+	for _i in 1 2 3; do
+		pip install -q --break-system-packages \
+			git+https://gitlab.postmarketos.org/postmarketOS/pmbootstrap.git@3.11.1 \
+			&& break
+		if [ "$_i" = 3 ]; then
+			echo "pmbootstrap pip install failed after 3 attempts" >&2
+			exit 1
+		fi
+		echo "pmbootstrap pip install failed (attempt $_i/3), retrying in 15s..." >&2
+		sleep 15
+	done
+	# containers cannot modprobe; make pmbootstrap's 'sudo modprobe' a no-op
+	# (/usr/local/sbin precedes /sbin in sudo's secure_path)
+	mkdir -p /usr/local/sbin
+	printf '#!/bin/sh\nexit 0\n' > /usr/local/sbin/modprobe
+	chmod +x /usr/local/sbin/modprobe
+	id build >/dev/null 2>&1 || adduser -D build
+	echo 'build ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/build
+	# su scrubs the environment — carry the knobs that matter across it
+	exec su build -c "IMSD_NO_CROSSDIRECT='${IMSD_NO_CROSSDIRECT:-}' sh -eu '$SRC/packaging/build-package.sh'"
+fi
+
+# the CI checkout is root-owned; let git read it as the build user
+git config --global --add safe.directory "$SRC"
+
+# git hosts occasionally hiccup; a clone failure costs a retry, not the run
+clone_retry() { # clone_retry <dest> <git clone args...>
+	_dest=$1; shift
+	for _i in 1 2 3; do
+		rm -rf "$_dest"
+		git clone "$@" "$_dest" && return 0
+		echo "git clone $_dest failed (attempt $_i/3), retrying in 10s..." >&2
+		sleep 10
+	done
+	echo "git clone $_dest failed after 3 attempts" >&2
+	return 1
+}
+
+retry() { # retry <description> <cmd...>
+	_desc=$1; shift
+	for _i in 1 2 3; do
+		"$@" && return 0
+		echo "$_desc failed (attempt $_i/3), retrying in 30s..." >&2
+		sleep 30
+	done
+	echo "$_desc failed after 3 attempts" >&2
+	return 1
+}
+
+# pmbootstrap swallows its subcommands' stderr into its own log; surface it
+# whenever this script dies so failures are diagnosable from CI output alone
+trap 'rc=$?; if [ $rc -ne 0 ]; then
+	echo "=== build-package.sh failed (exit $rc); pmbootstrap log tail ==="
+	tail -60 "$HOME/.local/var/pmbootstrap/log.txt" 2>/dev/null || true
+fi' EXIT
+
+# --- pmaports with our aport dropped in; source tarball from this checkout
+# (the Forgejo instance serves no source archives, so git-archive it)
+WORK=${IMSD_PKG_WORK:-$HOME/imsd-pkg-work}
+rm -rf "$WORK"
+mkdir -p "$WORK"
+clone_retry "$WORK/pmaports" -q --depth=1 "$PMAPORTS_REPO"
+mkdir -p "$WORK/pmaports/modem"
+cp -r "$SRC/packaging/aport" "$WORK/pmaports/modem/imsd"
+COMMIT=$(git -C "$SRC" rev-parse --short HEAD)
+git -C "$SRC" archive --prefix=imsd/ \
+	-o "$WORK/pmaports/modem/imsd/imsd-$COMMIT.tar.gz" HEAD
+sed -i "s/^_commit=.*/_commit=\"$COMMIT\"/" "$WORK/pmaports/modem/imsd/APKBUILD"
+
+# --- configure pmbootstrap (config written directly; 'init' is interactive)
+WORKDIR="$HOME/.local/var/pmbootstrap"
+mkdir -p "$WORKDIR/cache_git"
+python3 -c "import pmb.config; print(pmb.config.work_version)" > "$WORKDIR/version"
+mkdir -p "$HOME/.config"
+cat > "$HOME/.config/pmbootstrap_v3.cfg" <<EOF
+[pmbootstrap]
+aports = $WORK/pmaports
+device = fairphone-fp6
+ui = console
+systemd = always
+EOF
+
+NOCROSS=${IMSD_NO_CROSSDIRECT:+--no-cross}
+
+pmbootstrap checksum imsd
+retry "build imsd" pmbootstrap $NOCROSS build --arch aarch64 imsd
+
+echo "=== built packages ==="
+ls -la "$WORKDIR"/packages/*/aarch64/imsd*.apk