Added dockerfile

Dockerfile

@@ -0,0 +1,42 @@
+
+###################################
+#Build stage
+FROM golang:1.11-alpine3.7 AS build-env
+
+ARG VIKUNJA_VERSION
+ENV TAGS "sqlite"
+
+#Build deps
+RUN apk --no-cache add build-base
+
+#Setup repo
+COPY . ${GOPATH}/src/code.vikunja.io/vikunja
+WORKDIR ${GOPATH}/src/code.vikunja.io/vikunja
+
+#Checkout version if set
+RUN if [ -n "${VIKUNJA_VERSION}" ]; then git checkout "${VIKUNJA_VERSION}"; fi \
+ && make clean generate build
+
+FROM alpine:3.7
+LABEL maintainer="maintainers@vikunja.io"
+
+EXPOSE 3456
+
+RUN apk --no-cache add \
+    bash \
+    ca-certificates \
+    curl \
+    gettext \
+    linux-pam \
+    openssh \
+    s6 \
+    sqlite \
+    su-exec \
+    tzdata
+
+ENTRYPOINT ["/usr/bin/entrypoint"]
+CMD ["/bin/s6-svscan", "/etc/s6"]
+
+COPY docker /
+COPY --from=build-env /go/src/code.vikunja.io/vikunja/vikunja /app/vikunja/vikunja
+RUN ln -s /app/vikunja/vikunja /usr/local/bin/vikunja