[Doc] Add doc for a script to build installer locally, and doc for testing winget install locally (#40805)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

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## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
1. Add instructions to build installer locally with a script
2. Add doc explaining how to install an installer by winget locally.
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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

.github/actions/spell-check/expect.txt

@@ -1440,6 +1440,7 @@ secpol
 securestring
 SEEMASKINVOKEIDLIST
 SELCHANGE
+selfhost
 SENDCHANGE
 sendvirtualinput
 serverside
@@ -1879,6 +1880,7 @@ winexe
 winforms
 winget
 wingetcreate
+wingetpkgs
 Winhook
 WINL
 winlogon

doc/devdocs/core/installer.md

@@ -87,6 +87,13 @@
 
 ### Building PowerToys Locally
 
+#### One stop script for building installer
+1. Open developer powershell for vs 2022
+2. Run tools\build\build-installer.ps1
+> For the first-time setup, please run the installer as an administrator. This ensures that the Wix tool can move wix.target to the desired location and trust the certificate used to sign the MSIX packages.
+
+The following manual steps will not install the MSIX apps (such as Command Palette) on your local installer.
+
 #### Prerequisites for building the MSI installer
 
 1. Install the [WiX Toolset Visual Studio 2022 Extension](https://marketplace.visualstudio.com/items?itemName=WixToolset.WixToolsetVisualStudio2022Extension).

doc/devdocs/development/test-winget-install-locally.md

@@ -0,0 +1,33 @@
+## If for any reason, you'd like to test winget install scenario, you can follow this doc:
+
+### Powertoys winget manifest definition:
+[winget repository](https://github.com/microsoft/winget-pkgs/tree/master/manifests/m/Microsoft/PowerToys)
+
+### How to test a winget installation locally:
+1. Get artifacts from release CI pipeline  Pipelines - Runs for PowerToys Signed YAML Release Build, or you can build one yourself by execute the 
+ 'tools\build\build-installer.ps1' script
+
+2. Get the artifact hash, this is required to define winget manifest
+```powershell
+cd /path/to/your/directory/contains/installer
+Get-FileHash -Path ".\<Installer-name>.exe" -Algorithm SHA256
+```
+ 3.  Host your installer.exe - Attention: staged github release artifacts or artifacts in release pipeline is not OK in this step
+You can self-host it or you can upload to a publicly available endpoint  
+**How to selfhost it** (A extremely simple way):
+```powershell
+python -m http.server 8000
+```
+
+4. Download a version folder from wingetpkgs like: [version 0.92.1](https://github.com/microsoft/winget-pkgs/tree/master/manifests/m/Microsoft/PowerToys/0.92.1)
+and you get **a folder contains 3 yml files**
+>note: Do not put any files other than these three in this folder
+
+5. Modify the yml files based on your version and the self hosted artifact link, and modify the sha256 hash for the installer you'd like to use
+
+6. Start winget install:
+```powershell
+#execute as admin
+winget settings --enable LocalManifestFiles
+winget install --manifest "<folder_path_of_manifest_files>" --architecture x64 --scope user
+```