Dockerfile

############################
# STEP 1 build executable binary
############################
FROM golang:alpine as builder

# Install git + SSL ca certificates.
# Git is required for fetching the dependencies.
# Ca-certificates is required to call HTTPS endpoints.
RUN apk update && apk add --no-cache git ca-certificates tzdata && update-ca-certificates

# Create appuser
RUN adduser -D -g '' appuser

WORKDIR $GOPATH/src/mypackage/myapp/
COPY . .

# Fetch dependencies.
RUN go get -d -v
# RUN go get -u github.com/gorilla/mux
# RUN go get gopkg.in/segmentio/analytics-go.v3

# Build the binary
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -a -installsuffix cgo -o /go/bin/event-triggers .

############################
# STEP 2 build a small image
############################
FROM scratch

# Import from builder.
COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd

# Copy our static executable
COPY --from=builder /go/bin/event-triggers /go/bin/event-triggers

# Use an unprivileged user.
USER appuser

# Application Endpoint
EXPOSE 4004

# Run the event-triggers binary.
ENTRYPOINT ["/go/bin/event-triggers"]