Improve Dockerfile (#256)

* Use npm ci over install to achive faster and more expectable build results;
Split copy package(-lock).json files and ci then to avoid reinstalling dependencies when not needed => Faster build times

* Stopp adding wasm type to mime.types, its already there (duplicate):
- avoids warning in console
- cleans up
- might have been missing in past nginx:alpine versions but now exists

* Change node tag from alpine and nginx to more specific ones for #260

.dockerignore

@@ -0,0 +1,2 @@
+node_modules/
+.git/

Dockerfile

@@ -1,20 +1,18 @@
 ## Builder
-FROM node:14-alpine as builder
+FROM node:17.4.0-alpine3.15 as builder
 
 WORKDIR /src
 
+COPY package.json package-lock.json /src
+RUN npm ci
 COPY . /src
-RUN npm install \
+RUN npm run build
-  && npm run build
 
 
 ## App
-FROM nginx:alpine
+FROM nginx:1.21.6-alpine
 
 COPY --from=builder /src/dist /app
 
-# Insert wasm type into Nginx mime.types file so they load correctly.
-RUN sed -i '3i\ \ \ \ application/wasm wasm\;' /etc/nginx/mime.types
-
 RUN rm -rf /usr/share/nginx/html \
   && ln -s /app /usr/share/nginx/html