feat(release): add packaging support for Arch, Debian, and RPM

* Implement Arch package build process in release workflow
* Add Debian and RPM packaging specifications
* Include man page installation in Makefile
* Create unitdore man page for documentation

pkg/centos/unitdore.spec

@@ -0,0 +1,45 @@
+Name:           unitdore
+Version:        0.1.0
+Release:        1%{?dist}
+Summary:        Manage container units via systemd
+
+License:        MIT
+URL:            https://warky.dev
+Source0:        %{name}-%{version}.tar.gz
+
+BuildRequires:  golang >= 1.21
+Requires:       systemd
+
+%description
+Unitdore bridges your container runtime (Podman, Docker) and systemd.
+It discovers running containers, stores them in a config file, and generates
+and manages systemd .service units for each one.
+
+%prep
+%autosetup
+
+%build
+export CGO_ENABLED=0
+go build \
+    -trimpath \
+    -ldflags "-X main.version=%{version}" \
+    -o %{name} .
+
+%install
+# Binary
+install -Dm755 %{name} %{buildroot}%{_bindir}/%{name}
+
+# Man page
+install -Dm644 docs/unitdore.1 %{buildroot}%{_mandir}/man1/unitdore.1
+
+# Config dir
+install -dm755 %{buildroot}%{_sysconfdir}/unitdore
+
+%files
+%{_bindir}/%{name}
+%{_mandir}/man1/unitdore.1*
+%dir %{_sysconfdir}/unitdore
+
+%changelog
+* Tue Apr 08 2026 Hein (Warky Devs) <hein@warky.dev> - 0.1.0-1
+- Initial package