add dockerfile

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.17-alpine as backend
+ENV CGO_ENABLED=0
+
+ADD . /build
+WORKDIR /build
+
+RUN apk add --no-cache --update git tzdata ca-certificates
+RUN go build -o /build/secretable -ldflags "-s -w" /build/cmd/secretable.go
+
+FROM alpine
+RUN mkdir /etc/secretable
+COPY --from=backend /build/secretable /srv/secretable
+
+WORKDIR /srv
+ENTRYPOINT ["/srv/secretable", "-c", "/etc/secretable/config.yaml"]