Add top-level Makefile and RPM spec file for packaging

Top-level Makefile can create tar and RPM files to release.
Also add *.tar.gz to .gitignore.

.gitignore

@@ -1,3 +1,4 @@
+*.tar.gz
 *.o
 .deps
 .gdb_history

Makefile

@@ -0,0 +1,34 @@
+NAME := alsa-scarlett-gui
+VERSION := $(shell git describe --abbrev=4 --always --tags | sed 's/-/./g')
+NAMEVER := $(NAME)-$(VERSION)
+TAR_FILE := $(NAMEVER).tar
+TARGZ_FILE := $(TAR_FILE).gz
+SPEC_FILE := $(NAME).spec
+
+default:
+	@echo "alsa-scarlett-gui"
+	@echo
+	@echo "If you want to build and install from source, please try:"
+	@echo "  cd src"
+	@echo "  make -j4"
+	@echo "  sudo make install"
+	@echo
+	@echo "This Makefile knows about packaging:"
+	@echo "  make tar"
+	@echo "  make rpm"
+
+tar: $(TARGZ_FILE)
+
+$(TARGZ_FILE):
+	git archive --format=tar --prefix=$(NAMEVER)/ HEAD > $(TAR_FILE)
+	sed 's_VERSION$$_$(VERSION)_' < $(SPEC_FILE).template > $(SPEC_FILE)
+	tar --append -f $(TAR_FILE) \
+		--transform s_^_$(NAMEVER)/_ \
+		--owner=root --group=root \
+		$(SPEC_FILE)
+	rm -f $(SPEC_FILE)
+	gzip < $(TAR_FILE) > $(TARGZ_FILE)
+	rm -f $(TAR_FILE)
+
+rpm: $(TARGZ_FILE)
+	rpmbuild -tb $(TARGZ_FILE)

alsa-scarlett-gui.spec.template

@@ -0,0 +1,33 @@
+Summary: ALSA Scarlett Gen 2/3 Control Panel
+Name: alsa-scarlett-gui
+Version: VERSION
+Release: 1%{?dist}
+License: GPLv3+ LGPLv3+
+Url: https://github.com/geoffreybennett/alsa-scarlett-gui
+Source: %{name}-%{version}.tar.gz
+
+%description
+
+alsa-scarlett-gui is a Gtk4 GUI for the ALSA controls presented by the
+Linux kernel Focusrite Scarlett Gen 2/3 Mixer Driver.
+
+%prep
+%setup
+
+%build
+make -C src -j4 VERSION=%{version} PREFIX=/usr
+
+%install
+%make_install -C src PREFIX=/usr
+DOCDIR=%{buildroot}/usr/share/doc/%{name}-%{version}
+mkdir -p $DOCDIR/img
+mkdir $DOCDIR/demo
+cp *.md $DOCDIR
+cp img/* $DOCDIR/img
+cp demo/* $DOCDIR/demo
+
+%files
+%doc /usr/share/doc/%{name}-%{version}
+/usr/bin/alsa-scarlett-gui
+/usr/share/applications/vu.b4.alsa-scarlett-gui.desktop
+/usr/share/icons/hicolor/256x256/apps/alsa-scarlett-gui.png