Dockerfile
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FROM golang:1.12.4-alpine AS build_deps
RUN apk add --no-cache git
WORKDIR /workspace
ENV GO111MODULE=on
COPY go.mod .
COPY go.sum .
RUN go mod download
FROM build_deps AS build
COPY . .
RUN CGO_ENABLED=0 go build -o webhook -ldflags '-w -extldflags "-static"' .
FROM alpine:3.9
RUN apk add --no-cache ca-certificates
COPY --from=build /workspace/webhook /usr/local/bin/webhook
ENTRYPOINT ["webhook"]