Add appcast task to make file

Author: intitni

Makefile

@@ -1,14 +1,20 @@
+GITHUB_URL := https://github.com/intitni/CopilotForXcode/
+ZIPNAME_BASE := Copilot.for.Xcode.app
+
 setup:
 	echo "Setup."
 
-setup-langchain:
-	echo "Don't setup LangChain!"
-	cd Python; \
-	curl -L https://github.com/beeware/Python-Apple-support/releases/download/3.11-b1/Python-3.11-macOS-support.b1.tar.gz -o Python-3.11-macOS-support.b1.tar.gz; \
-	tar -xzvf Python-3.11-macOS-support.b1.tar.gz; \
-	rm Python-3.11-macOS-support.b1.tar.gz; \
-	cp module.modulemap.copy Python.xcframework/macos-arm64_x86_64/Headers/module.modulemap
-	cd Python/site-packages; \
-	sh ./install.sh
+# Usage: make appcast app=path/to/bundle.app tag=1.0.0 [channel=beta] [release=1]
+appcast:
+	$(eval TMPDIR := ~/Library/Caches/CopilotForXcodeRelease/$(shell uuidgen))
+	$(eval BUNDLENAME := $(shell basename "$(app)"))
+	$(eval ZIPNAME := $(ZIPNAME_BASE).$(if $(channel),$(channel).)$(if $(release),$(release),1).zip)
+	mkdir -p $(TMPDIR)
+	cp appcast.xml $(TMPDIR)/appcast.xml
+	cd "$(app)" && cd .. && zip -r "$(ZIPNAME)" "$(BUNDLENAME)"
+	cd "$(app)" && cd .. && cp "$(ZIPNAME)" $(TMPDIR)/
+	-Core/.build/artifacts/sparkle/bin/generate_appcast $(TMPDIR) --download-url-prefix "$(GITHUB_URL)releases/download/$(tag)/" --full-release-notes-url "$(GITHUB_URL)releases/tag/$(tag)" $(if $(channel),--channel "$(channel)")
+	mv -f $(TMPDIR)/appcast.xml .
+	rm -rf $(TMPDIR)
 
-.PHONY: setup setup-langchain
+.PHONY: setup appcast