Address PR review feedback

- Add SHELL declaration to Makefile for bash compatibility
- Add check that release is run from main branch
- Use jq instead of grep -oP for JSON parsing in release.yml
- Move checkout before git ls-remote in create-release.yml
- Add --allow-empty to commit in create-release.yml

https://claude.ai/code/session_0158SxS2ATe6PL8zTpsoHRFn

Makefile

@@ -1,3 +1,4 @@
+SHELL := /usr/bin/env bash
 .PHONY: test build package clean
 
 PLUGIN_NAME := discord-rich-presence
@@ -19,6 +20,7 @@ release: test
 	@if [[ ! "${V}" =~ ^[0-9]+\.[0-9]+\.[0-9]+.*$$ ]]; then echo "Usage: make release V=X.X.X"; exit 1; fi
 	go mod tidy
 	@if [ -n "`git status -s`" ]; then echo "\n\nThere are pending changes. Please commit or stash first"; exit 1; fi
+	@if [[ "$$(git branch --show-current)" != "main" ]]; then echo "Releases must be created from the main branch"; exit 1; fi
 	@# Update version in manifest.json
 	@sed -i 's/"version": *"[^"]*"/"version": "${V}"/' manifest.json
 	git add manifest.json