porting all github actions from bluesky-social/indigo to tangled CI

add goat to 'make build'

Changed files
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Makefile
··· 16 17 .PHONY: build 18 build: ## Build all executables 19 go build ./cmd/gosky 20 go build ./cmd/bigsky 21 go build ./cmd/relay
··· 16 17 .PHONY: build 18 build: ## Build all executables 19 + go build ./cmd/goat 20 go build ./cmd/gosky 21 go build ./cmd/bigsky 22 go build ./cmd/relay