Added Dockerfile

Author: funkypenguin

Dockerfile

@@ -0,0 +1,26 @@
+# Built following https://medium.com/@chemidy/create-the-smallest-and-secured-golang-docker-image-based-on-scratch-4752223b7324
+
+# STEP 1 build executable binary
+FROM golang:alpine as builder
+# Install SSL ca certificates
+RUN apk update && apk add git && apk add ca-certificates
+# Create appuser
+RUN adduser -D -g '' appuser
+COPY . $GOPATH/src/mypackage/myapp/
+WORKDIR $GOPATH/src/mypackage/myapp/
+#get dependancies
+RUN go get -d -v
+#build the binary
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags="-w -s" -o /go/bin/alertmanager-discord
+
+
+# STEP 2 build a small image
+# start from scratch
+FROM scratch
+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/alertmanager-discord /go/bin/alertmanager-discord
+USER appuser
+ENTRYPOINT ["/go/bin/alertmanager-discord"]
+