Run gulp via cake Start-Process - gulp

Question

I'm building site via gulp inside a windows container:
mcr.microsoft.com/dotnet/framework/sdk:4.8-windowsservercore-1909
The container have nodejs and gulp-cli installed in it as following (in Dockerfile):
#Install NodeJs
RUN (New-Object Net.WebClient).DownloadFile('https://nodejs.org/dist/v12.16.3/node-v12.16.3-win-x64.zip', 'node.zip'); \
Expand-Archive -LiteralPath 'node.zip' -DestinationPath '.' ; \
Start-Process -FilePath '.\node-v12.16.3-win-x64\npm' -NoNewWindow -Wait -ArgumentList 'install -g gulp-cli' ; \
$env:PATH = 'c:\tools\node-v12.16.3-win-x64;' + $env:PATH; \
[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine);
As you can see I'm installing node in the container under c:\tools\node-v12.16.3-win-x64.
In my cake script i try to execute gulp file as following:
StartProcess("cmd", new ProcessSettings {
Arguments = "/c gulp",
WorkingDirectory = projectDir)
});
But seems that Start-Process cannot find the file... I'm getting this output from cake Start-Process:
Executing: "cmd" /c gulp
'gulp' is not recognized as an internal or external command
Running the container interactive I can see the file it is in that place and if I run gulp from projectDir all works.
I've also try it to run it like all of the following forms without success:
StartProcess("powershell", new ProcessSettings {
Arguments = "gulp",
WorkingDirectory = projectDir)
});
StartProcess("gulp");
StartProcess("gulp.cmd");
This is the output from within the container regarding npn, gulp versions (requested from comments):

Answer 1

EDIT:
That 'Local version: Unknown' seems off. Is C:\code your project directory?
When I look at the 'official' gulp configuration steps, the installation results in having both a CLI and local version.
(see: https://gulpjs.com/docs/en/getting-started/quick-start/ )
You could consider using Cake.Gulp which can help run gulp with cake either from a local or global installation:
Namespace: https://cakebuild.net/api/Cake.Gulp/
Example usage: https://cake-contrib.github.io/Cake.Gulp/docs/usage/examples
Perhaps making sure that npm installed gulp locally might do the trick because cake is expecting a local variant. I am unfortunately inexperienced with cake, so this is my best guess after doing some basic research.
(one of my sources: Why do we need to install gulp globally and locally? )
Original answer
You could try using an absolute path to the gulp application.
For example:
StartProcess("cmd", new ProcessSettings {
Arguments = "/c c:\tools\node-v12.16.3-win-x64\gulp",
WorkingDirectory = projectDir)
});
It could be that your environment is not set properly, I found this that could be of use: Appending to PATH in a Windows Docker container