fix(dockerfile): disable TreatWarningsAsErrors for Docker publish step

StyleCop analyzer violations in upstream src/Jellyfin.Extensions/ block
the Docker build when TreatWarningsAsErrors=true (from Directory.Build.props).
Disable for container image builds — StyleCop enforcement is the CI pipeline's
responsibility, not the Dockerfile's.

Dockerfile

@@ -31,11 +31,15 @@ RUN dotnet restore Jellyfin.Server/Jellyfin.Server.csproj \
 
 # Publish the server (and all transitive dependencies, including the
 # PostgreSQL provider assembly added by this fork).
+# Note: TreatWarningsAsErrors is disabled for the Docker build — StyleCop
+# analyzer violations in upstream src/ projects would otherwise block the
+# image build. StyleCop is enforced in the CI pipeline, not the Dockerfile.
 RUN dotnet publish Jellyfin.Server/Jellyfin.Server.csproj \
       --configuration Release \
       --runtime linux-x64 \
       --self-contained false \
       --no-restore \
+      -p:TreatWarningsAsErrors=false \
       --output /app
 
 # ── Runtime stage ─────────────────────────────────────────────────────────────