Merge pull request #154 from eerhardt/UpdateDevGuide

Update DEVGUIDE for local testing

Author: baronfel

DEVGUIDE.md

@@ -15,6 +15,27 @@ Then, you can use `dotnet add package Microsoft.NET.Build.Containers -prerelease
 
 You can also always clone this repository, run `dotnet build`, and use the newly-generated nupkg.
 
+To use your locally built packages:
+
+* Add a local nuget source:
+  * `dotnet nuget add source C:\temp\packages -n local`
+* Build the repo and note where the .nupkg is outputted:
+  * `dotnet build -c Release`
+  * ...
+  * `Successfully created package 'C:\git\sdk-container-builds\Microsoft.NET.Build.Containers\bin\Release\Microsoft.NET.Build.Containers.0.2.0-alpha.14.gda83f2fee0.nupkg'.`
+* Push the generated package to the local source:
+  * `dotnet nuget push C:\git\sdk-container-builds\Microsoft.NET.Build.Containers\bin\Release\Microsoft.NET.Build.Containers.0.2.0-alpha.14.gda83f2fee0.nupkg -s local`
+* In a test project, add the local package:
+  * `dotnet add package Microsoft.NET.Build.Containers --version 0.2.0-alpha.14.gda83f2fee0`
+* Publish the test project with `-p:PublishProfile=DefaultContainer` to create a container for your application:
+  * `dotnet publish -c Release --os linux --arch x64 -p:PublishProfile=DefaultContainer`
+* Run your test app to ensure it works
+  * `docker run -it --rm -p 5010:80 myapp:1.0.0`
+
+**NOTE**: Rebuilding and restoring local NuGet packages may cause versioning conflicts due to NuGet caching earlier iterations with the same version number. Be sure to delete the `microsoft.net.build.containers` folder in the NuGet cache in between building and restoring new changes to this repo. For example:
+  * `rmdir -Force -Recurse ~\.nuget\packages\microsoft.net.build.containers`
+  * `rm -rf ~/.nuget/packages/microsoft.net.build.containers`
+
 ## References
 
 * [OCI Image Format spec](https://github.com/opencontainers/image-spec/blob/main/spec.md)