fix(docker): change to docker alpine

Dockerfile

@@ -1,10 +1,10 @@
-FROM node:18 AS builder
+FROM node:18.20.4-alpine AS builder
 WORKDIR /spooty
 COPY . .
 RUN npm ci
 RUN npm run build
 
-FROM node:18
+FROM node:18.20.4-alpine
 WORKDIR /spooty
 COPY --from=builder /spooty/dist .
 COPY --from=builder /spooty/src ./src
@@ -13,7 +13,7 @@ COPY --from=builder /spooty/package-lock.json ./package-lock.json
 COPY --from=builder /spooty/src/backend/.env.default ./.env
 RUN rm -rf node_modules
 RUN npm ci --omit=dev
-RUN apt-get -y update && apt-get -y upgrade && apt-get install -y --no-install-recommends ffmpeg
 RUN rm -rf src package.json package-lock.json
+RUN apk add --no-cache ffmpeg
 EXPOSE 3000
 CMD ["node", "backend/main.js"]