add webhook

webhook/Dockerfile

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+#
+# Dockerfile for webhook
+#
+
+FROM scratch
+COPY webhook /
+ENTRYPOINT ["/webhook"]
+CMD ["-help"]

webhook/Makefile

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+.PHONY: webhook
+
+export GOPATH = /tmp/go
+export GOOS = linux
+export GOARCH = amd64
+
+webhook:
+	go get -d github.com/adnanh/webhook
+	go build --ldflags '-s -extldflags "-static"' -i -o webhook github.com/adnanh/webhook
+
+clean:
+	rm -rf $(GOPATH)
+	rm -f webhook

webhook/README.md

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+webhook
+=======
+
+[webhook][1] is a lightweight configurable tool written in Go, that allows you
+to easily create HTTP endpoints (hooks) on your server, which you can use to
+execute configured commands.
+
+[1]: https://github.com/adnanh/webhook