[CI] Fix NuGet restore: use Liara mirror (Nexus TLS chain incomplete)

mirror.soroushasadi.com serves a leaf-only TLS chain (no intermediate).
.NET on Linux does not auto-fetch the intermediate via AIA like Windows
does, so CI/Docker restores fail with NU1301 PartialChain. Switch the
Linux build configs (CI inline config + nuget.docker.config) to the
Liara mirror, which serves a complete chain. Also disable NuGetAudit to
avoid the api.nuget.org (filtered) 100s timeout + NU1900 noise.

Local dev nuget.config keeps Nexus primary (Windows resolves the chain).
Re-add Nexus to the Linux configs once nginx serves fullchain.pem.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -3,9 +3,9 @@ FROM mirror.soroushasadi.com/dotnet/sdk:10.0 AS build
 WORKDIR /src
 COPY nuget.docker.config /tmp/nuget.config
 COPY src/ ./src/
-RUN dotnet restore src/JobsMedical.Web/JobsMedical.Web.csproj --configfile /tmp/nuget.config
+RUN dotnet restore src/JobsMedical.Web/JobsMedical.Web.csproj --configfile /tmp/nuget.config -p:NuGetAudit=false
 RUN dotnet publish src/JobsMedical.Web/JobsMedical.Web.csproj -c Release -o /out --no-restore \
-    /p:UseAppHost=false
+    /p:UseAppHost=false /p:NuGetAudit=false
 
 FROM mirror.soroushasadi.com/dotnet/aspnet:10.0
 WORKDIR /app