Docker中dotnet restore失败：无法加载私有NuGet源服务索引（NU1301）

在Dockerfile中执行dotnet restore <project>命令时，触发NU1301: Unable to load the service index for source错误，已尝试以下排查操作但问题仍未解决：

• 将Docker Engine的DNS设置为8.8.8.8
• 使用Linux容器
• 执行RUN ping google.com成功，容器可正常访问互联网
• 能正常访问nuget.org源
• nuget.config文件中配置了凭据（后续会替换方案，且凭据与本地开发使用的用户名/PAT一致）
• 执行RUN curl <nuget_feed_url>成功，可访问私有NuGet源地址
• 添加--verbosity detailed参数执行restore，仅返回上述错误，无额外信息

相关Dockerfile片段 #

FROM mcr.microsoft.com/dotnet/aspnet:6.0.13 AS base
# Create dockeruser in base layer
RUN addgroup --system --gid 1000 dockergroup \
    && adduser --system --uid 1000 --ingroup dockergroup --shell /bin/sh dockeruser

WORKDIR /app
EXPOSE 8080

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
# Arguments are required in each stage in order to get the correct value

WORKDIR /src
COPY ["src/Nucleus.LumberYard.API/", "Nucleus.LumberYard.API/"]
COPY ["./nuget.config", "./nuget.config"]

WORKDIR "/src/Nucleus.LumberYard.API"
#COPY [".editorconfig", "./"]
RUN dotnet restore "Nucleus.LumberYard.API.csproj"
RUN dotnet build "Nucleus.LumberYard.API.csproj" -c Release --no-restore

环境信息 #

• Docker Desktop v3.3.1
• Docker v20.10.5

内容的提问来源于stack exchange，提问作者Logan K