Dockerfile now named correctly

Dockerfile is now named correctly, and pulls from the local repository/directory instead of pulling the image from github.

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:18-bullseye AS builder
+
+WORKDIR /devel
+RUN apt-get update ; apt-get upgrade -y ; apt-get install -y build-essential
+COPY . .
+RUN npm i ; npm run build
+
+FROM node:18-alpine
+
+EXPOSE 8080
+WORKDIR /exec
+RUN apk add --update nodejs npm
+COPY --from=builder /devel/ . 
+RUN adduser -D jankclient
+
+USER jankclient
+
+CMD ["npm", "start"]