ci: build release binaries and upload as artifacts

Add Makefile with build, install, and release targets.

Author: claude

.github/workflows/ci.yml

@@ -21,6 +21,15 @@ jobs:
       - name: Test
         run: swift test
 
+      - name: Build release
+        run: swift build --configuration release
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v4
+        with:
+          name: mtpx-macos-arm64
+          path: .build/release/mtpx
+
   build-and-test-linux:
     runs-on: ubuntu-24.04
     container: swift:6.2-noble
@@ -35,3 +44,12 @@ jobs:
 
       - name: Test
         run: swift test
+
+      - name: Build release
+        run: swift build --configuration release
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v4
+        with:
+          name: mtpx-linux-amd64
+          path: .build/release/mtpx

Makefile

@@ -0,0 +1,28 @@
+prefix ?= /usr/local
+bindir = $(prefix)/bin
+
+version := $(shell git describe --tags 2>/dev/null || echo dev)
+
+.PHONY: build
+build:
+	swift build --configuration release
+
+.PHONY: install
+install: build
+	install -d "$(bindir)"
+	install ".build/release/mtpx" "$(bindir)"
+
+.PHONY: uninstall
+uninstall:
+	rm -f "$(bindir)/mtpx"
+
+.PHONY: release
+release: release/mtpx-$(version).tar.bz2
+
+release/mtpx-$(version).tar.bz2: build
+	mkdir -p release
+	tar --create --bzip2 --file release/mtpx-$(version).tar.bz2 --directory .build/release mtpx
+
+.PHONY: clean
+clean:
+	rm -rf release