Add creation of docker image and github actions.

Dockerfile

@@ -0,0 +1,17 @@
+# syntax=docker/dockerfile:1.2.1-labs
+
+FROM golang:1-alpine as baseimg
+
+RUN apk add make
+WORKDIR /go/src/app
+ENV GO111MODULE=on CGO_ENABLED=1 GOOS=linux
+COPY . /go/src/app/
+RUN make
+
+FROM alpine:latest
+RUN apk add --no-cache ca-certificates
+WORKDIR /go/src/app
+COPY --from=baseimg /go/src/app/semver-gen .
+COPY --from=baseimg /go/src/app/config-release.yaml config.yaml
+
+CMD ["./semver-gen"]