remove yarn from backend

Author: TheSwerik

src/Api/Dockerfile

@@ -3,8 +3,6 @@
 FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine as builder
 WORKDIR /build
 COPY ../../. .
-RUN apk add --no-cache nodejs npm
-RUN npm install -g yarn
 RUN dotnet publish src/Api/Api.csproj -c Release -o /build/publish
 
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