Add support for deploying from TS source

Signed-off-by: Fred Boniface <fred@fjla.uk>

Dockerfile

@@ -1,7 +1,16 @@
-FROM node:19
+FROM node:20 as builder
 EXPOSE 8460
 WORKDIR /usr/src/app
 COPY ./package*.json ./
-RUN npm ci --omit=dev
+RUN npm i
 COPY . .
-CMD [ "node", "app.js" ]
+RUN npm run build
+
+FROM node:20-slim
+EXPOSE 8460
+WORKDIR /usr/src/app
+COPY ./mail-templates/* ./mail-templates/
+COPY ./package*.json ./
+RUN npm ci --omit=dev
+COPY --from=builder /usr/src/app/dist/ ./
+CMD [ "node" , "app.js" ]