Adds a Dockerfile that creates a terragrunt image

Author: lorengordon

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.16.3-alpine as builder
+
+RUN apk add --update --no-cache make git
+
+WORKDIR /go/src/terragrunt
+
+COPY . .
+
+RUN make build
+
+###
+
+FROM alpine:latest
+
+COPY --from=builder /go/src/terragrunt /usr/local/bin/
+
+CMD ["terragrunt"]