Upgrade to go1.16, use go:embed for bundling assets (#555)

docker/tmpl.Dockerfile

@@ -1,37 +1,52 @@
-############################
-# STEP 1 build executable binary
-############################
-FROM golang:1.14-alpine as builder
+# STEP 1 build ui
+FROM node:14-alpine as node
 
-# 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 alpine-sdk npm && update-ca-certificates
+RUN apk update && apk add --no-cache make
 
 WORKDIR /build
 
-# cache modules
-COPY go.mod .
-COPY go.sum .
-RUN go mod download
-
-# install go and node tools
+# install node tools
 COPY Makefile .
 COPY package*.json ./
-RUN make install
+RUN make install-ui
 
 # build ui
 COPY assets assets
 COPY vue.config.js vue.config.js
-RUN make clean npm
+RUN make clean ui
 
+
+# STEP 2 build executable binary
+FROM golang:1.16-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 alpine-sdk && update-ca-certificates
+
+WORKDIR /build
+
+# install go tools and cache modules
+COPY Makefile .
+COPY go.mod .
+COPY go.sum .
+RUN make install
+RUN go mod download
+
+# prepare
+COPY . .
+RUN make assets
+
+# copy ui
+COPY --from=node /build/dist /build/dist
+
+# build
 COPY . .
 RUN make assets
 RUN GOARCH={{ .GoARCH }} GOARM={{ .GoARM }} make build
 
-#############################
-## STEP 2 build a small image
-#############################
+
+# STEP 3 build a small image including module support
 FROM {{ .RuntimeImage }}
 
 ENV TZ=Europe/Berlin