build: adjust docker build to pass the frontend artifacts

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: 1.21.2
+        go-version: 1.22.1
 
     - name: Install dependencies
       run: go mod download

Dockerfile

@@ -1,13 +1,24 @@
+FROM node:20-alpine AS web-build
+
+WORKDIR /build
+COPY ./web/package.json .
+RUN npm install
+COPY ./web .
+RUN npm run build
+
 FROM golang:1.22.1-alpine AS build
 
 WORKDIR /build
+# TODO: exclude web files using --exclude when available in stable syntax
+# https://docs.docker.com/reference/dockerfile/#copy---exclude
 COPY . .
+COPY --from=web-build /build/dist ./web/dist
 RUN go mod download
 RUN go build -o undershorts ./cmd/undershorts/main.go
 
 FROM alpine:3 AS final
 
 WORKDIR /app
 COPY --from=build /build/undershorts .
-COPY --from=build /build/web ./web
+
 CMD [ "/app/undershorts" ]