build: add Debian packaging and CI

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  debian:
+    name: Debian
+    runs-on: ubuntu-latest
+    container: docker.io/library/debian:sid
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+      - name: Update repository
+        run: apt-get update -y
+      - name: Install build tools
+        run: apt-get install -y equivs devscripts lintian build-essential cmake debhelper gtk-update-icon-cache
+      - name: Install build dependencies
+        run: mk-build-deps -i -t "apt-get --yes" -r
+      - name: Build package
+        run: dpkg-buildpackage -b -uc -us -j"$(nproc)"

debian/changelog

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+cutefish-icon-theme (1.0.0-1) unstable; urgency=medium
+
+  * Replace the legacy icon set with the Colloid-based theme.
+  * Add CMake installation and Debian packaging support.
+
+ -- CutefishOS <support@cutefishos.com>  Sat, 05 Sep 2026 00:00:00 -0400

debian/control

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+Source: cutefish-icon-theme
+Section: x11
+Priority: optional
+Maintainer: CutefishOS <support@cutefishos.com>
+Standards-Version: 4.6.2
+Build-Depends:
+    cmake,
+    debhelper-compat (= 13),
+    gtk-update-icon-cache
+Rules-Requires-Root: no
+Homepage: https://cutefishos.com
+
+Package: cutefish-icon-theme
+Architecture: all
+Depends: ${misc:Depends}
+Description: CutefishOS icon theme
+ CutefishOS icon theme based on Colloid-icon-theme.

debian/copyright

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+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: cutefish-icon-theme
+Source: https://github.com/cutefishos/icons
+
+Files: *
+Copyright: CutefishOS contributors
+License: GPL-3+
+
+License: GPL-3+
+ This package is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+ .
+ This package is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ .
+ You should have received a copy of the GNU General Public License
+ along with this package.  If not, see <https://www.gnu.org/licenses/>.

debian/rules

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+#!/usr/bin/make -f
+
+%:
+	dh $@

debian/source/format

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+3.0 (quilt)