Update Dockerfile

Don't pin alpine/node versions

Dockerfile

@@ -1,20 +1,23 @@
-FROM node:19 AS web-build
+FROM node AS web-build
 WORKDIR /broadcast-box/web
 COPY . /broadcast-box
 RUN npm install && npm run build
 
-FROM golang:1.19-alpine AS go-build
+FROM golang:alpine AS go-build
 WORKDIR /broadcast-box
 ENV GOPROXY=direct
 ENV GOSUMDB=off
 COPY . /broadcast-box
 RUN apk add git
 RUN go build
 
-FROM golang:1.19-alpine
+FROM golang:alpine
 COPY --from=web-build /broadcast-box/web/build /broadcast-box/web/build
 COPY --from=go-build /broadcast-box/broadcast-box /broadcast-box/broadcast-box
 COPY --from=go-build /broadcast-box/.env.production /broadcast-box/.env.production
-WORKDIR /broadcast-box
+
 ENV APP_ENV=production
+ENV NETWORK_TEST_ON_START=true
+
+WORKDIR /broadcast-box
 ENTRYPOINT ["/broadcast-box/broadcast-box"]