Initial scaffold: README, distcc-avahi PKGBUILD, CI stub

- README documents repo layout, client setup (Arch+Debian),
  signing-key fingerprint, and infra TODOs.
- arch/distcc-avahi/: ALARM distcc PKGBUILD with --with-avahi,
  avahi dep, distccd.service + conf.d + tmpfiles.
- .gitea/workflows/build.yml: placeholder with wiring sketch
  for the real pipeline (runners, signing, scp publish).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

arch/distcc-avahi/PKGBUILD

@@ -0,0 +1,70 @@
+# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+# Based on Arch Linux ARM's distcc PKGBUILD, rebuilt with --with-avahi
+# so Zeroconf-announced compile servers are discoverable on the LAN.
+#
+# Why this exists: the ALARM aarch64 distcc binary package is built
+# without --with-avahi, so the distccd --zeroconf flag is a no-op.
+# The Arch x86_64 package is fine. This package replaces distcc on
+# ALARM hosts with an avahi-aware build.
+
+pkgname=distcc-avahi
+_pkgname=distcc
+pkgver=3.4
+pkgrel=15
+pkgdesc="Distributed compilation service for C, C++ and Objective-C (with Avahi/Zeroconf support)"
+arch=('x86_64' 'aarch64')
+url="https://github.com/distcc/distcc"
+license=('GPL-2.0-only')
+depends=('popt' 'python' 'avahi')
+makedepends=('autoconf' 'automake' 'libtool' 'pkgconf' 'python-setuptools')
+optdepends=('gtk3: for distccmon')
+provides=("distcc=${pkgver}")
+conflicts=('distcc')
+replaces=('distcc')
+backup=('etc/conf.d/distccd')
+source=(
+    "https://github.com/distcc/distcc/releases/download/v${pkgver}/distcc-${pkgver}.tar.gz"
+    "distccd.conf"
+    "distccd.service"
+    "distcc.tmpfiles"
+)
+sha256sums=(
+    'SKIP'  # pin when first built in CI
+    'SKIP'
+    'SKIP'
+    'SKIP'
+)
+
+prepare() {
+    cd "${_pkgname}-${pkgver}"
+    autoreconf -fiv
+}
+
+build() {
+    cd "${_pkgname}-${pkgver}"
+    ./configure \
+        --prefix=/usr \
+        --sysconfdir=/etc \
+        --mandir=/usr/share/man \
+        --with-auth \
+        --with-avahi \
+        --without-libiberty \
+        --enable-rfc2553 \
+        --with-docdir="/usr/share/doc/${pkgname}"
+    make
+    make -C doc
+}
+
+check() {
+    cd "${_pkgname}-${pkgver}"
+    # Upstream test suite is flaky under makepkg; skip unless CHECK=1.
+    [ "${CHECK:-0}" = "1" ] && make check || true
+}
+
+package() {
+    cd "${_pkgname}-${pkgver}"
+    make DESTDIR="${pkgdir}" prefix=/usr install
+    install -Dm644 ../distccd.conf    "${pkgdir}/etc/conf.d/distccd"
+    install -Dm644 ../distccd.service "${pkgdir}/usr/lib/systemd/system/distccd.service"
+    install -Dm644 ../distcc.tmpfiles "${pkgdir}/usr/lib/tmpfiles.d/distcc.conf"
+}

arch/distcc-avahi/distcc.tmpfiles

@@ -0,0 +1 @@
+d /var/log/distcc 0755 nobody nobody -

arch/distcc-avahi/distccd.conf

@@ -0,0 +1,5 @@
+# Configuration for distccd.service
+#
+# --allow lists are whitespace-separated CIDR blocks. At minimum,
+# allow our LAN and VPN:
+DISTCC_OPTS="--allow 192.168.88.0/24 --allow 10.170.16.0/24 --zeroconf --jobs 16 --nice 5 --log-level info --log-stderr"

arch/distcc-avahi/distccd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=distcc compile server (Zeroconf-announced)
+After=network-online.target avahi-daemon.service
+Wants=network-online.target avahi-daemon.service
+
+[Service]
+Type=simple
+EnvironmentFile=/etc/conf.d/distccd
+User=nobody
+Group=nobody
+ExecStart=/usr/bin/distccd --no-detach --daemon $DISTCC_OPTS
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target