Provide the complete Debian package build toolchain in CI

Author: Shadowfetch

.github/workflows/build-iso.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install source and package test dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y debhelper dh-python devscripts fakeroot python3 python3-yaml python3-pyqt6 python3-dbus python3-psutil shellcheck desktop-file-utils bubblewrap ffmpeg
+          sudo apt-get install -y build-essential debhelper dh-python devscripts fakeroot python3 python3-yaml python3-pyqt6 python3-dbus python3-psutil shellcheck desktop-file-utils bubblewrap ffmpeg
       - name: Test behavior
         run: make test
       - name: Validate source syntax and desktop entries