Document dotnet pack nuspec

[nkolev92]

dotnet pack now supports supports a nuspec.

So running dotnet pack mypkg.nuspec now works.

It seems like --version was added as well and it's not documented either.

Relevant content:
dotnet/sdk#49813
https://github.com/NuGet/Home/blob/dev/accepted/2025/dotnet-pack-nuspec.md

E:\NuGet\nuget.client [dev ≡]> dotnet pack --help
Description:
  .NET Core NuGet Package Packer

Usage:
  dotnet pack [<PROJECT | SOLUTION | FILE>...] [options]

Arguments:
  <PROJECT | SOLUTION | FILE>  The project or solution or C# (file-based program) file to operate on. If a file is not specified, the command will search the current directory for a project or solution.

Options:
  -o, --output <OUTPUT_DIR>            The output directory to place built packages in.
  --artifacts-path <ARTIFACTS_DIR>     The artifacts path. All output from the project, including build, publish, and pack output, will go in subfolders under the specified path.
  --no-build                           Do not build the project before packing. Implies --no-restore. [default: False]
  --include-symbols                    Include packages with symbols in addition to regular packages in output directory. [default: False]
  --include-source                     Include PDBs and source files. Source files go into the 'src' folder in the resulting nuget package. [default: False]
  -s, --serviceable                    Set the serviceable flag in the package. See https://aka.ms/nupkgservicing for more information. [default: False]
  -nologo, --no-logo                   Do not display the startup banner or the copyright message. [default: True]
  --interactive                        Allows the command to stop and wait for user input or action (for example to complete authentication). [default: True]
  --no-restore                         Do not restore the project before building. [default: False]
  -v, -verbosity <LEVEL>               Set the MSBuild verbosity level. Allowed values are q[uiet], m[inimal], n[ormal], d[etailed], and diag[nostic].
  --version-suffix <VERSION_SUFFIX>    Set the value of the $(VersionSuffix) property to use when building the project.
  --version <VERSION>                  The version of the package to create
  -c, --configuration <CONFIGURATION>  The configuration to use for building the package. The default is 'Release'.
  --disable-build-servers              Force the command to ignore any persistent build servers. [default: False]
  --ucr, --use-current-runtime         Use current runtime as the target runtime. [default: False]
  -r, --runtime <RUNTIME_IDENTIFIER>   The target runtime to build for.
  -?, -h, --help                       Show command line help.

E:\NuGet\nuget.client [dev ≡]>

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Document Details

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• ID: a7e805a3-f2ec-b05a-d5c8-29f7a8c16a5f
• Version Independent ID: 4257ec12-df6f-ec52-aad3-012e5fce8133
• Platform ID: 3ad7cdeb-d048-a6b1-b08b-d01247b833fe
• Content: dotnet pack command - .NET CLI
• Content Source: docs/core/tools/dotnet-pack.md
• Service: dotnet-fundamentals
• GitHub Login: @meaghanlewis
• Microsoft Alias: mosagie

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Associated WorkItem - 566952

[gewarren]

I'll take this since Meaghan is out.