feat: add msi support

[djgilcrease]

Uses the pure go https://github.com/digitalxero/go-msi to generate msi & msp (a installer patch) files

https://github.com/goreleaser/nfpm/actions/runs/27466651901/job/81190128643

[codecov]

Codecov Report

❌ Patch coverage is 76.29870% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.18%. Comparing base (886e929) to head (e6ed5ff).

Files with missing lines	Patch %	Lines
msi/msi.go	76.33%	41 Missing and 30 partials ⚠️
nfpm.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1097      +/-   ##
==========================================
+ Coverage   73.96%   74.18%   +0.21%     
==========================================
  Files          22       23       +1     
  Lines        2777     3083     +306     
==========================================
+ Hits         2054     2287     +233     
- Misses        497      539      +42     
- Partials      226      257      +31     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[cloudflare-workers-and-pages]

Deploying nfpm with    Cloudflare Pages

Latest commit:	e6ed5ff
Status:	✅  Deploy successful!
Preview URL:	https://8b3e6666.nfpm.pages.dev
Branch Preview URL:	https://msi-builder.nfpm.pages.dev

View logs

[Copilot]

Pull request overview

This PR adds a new msi packager to nfpm, enabling generation of Windows Installer .msi packages (and associated config/schema/docs) using the pure-Go go-msi library, plus CI/acceptance coverage for MSI structure and Windows install verification.

Changes:

• Introduces a new msi packager implementation and unit tests (msi/).
• Extends nfpm configuration (nfpm.go), schema (www/static/schema.json), and docs (www/content/docs/configuration.md) with MSI-specific fields.
• Adds MSI acceptance test configs/scripts and wires them into Taskfile and GitHub Actions.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
www/static/schema.json	Adds JSON schema definitions and references for the new msi config block.
www/content/docs/configuration.md	Documents MSI-specific configuration and conventions (Windows destinations, services, registry, signing).
testdata/acceptance/msi.install.yaml	Adds Windows install-test MSI config used by Taskfile/CI.
testdata/acceptance/msi.basic.yaml	Adds MSI acceptance config used by TestMSIStructure.
testdata/acceptance/install-msi.ps1	Adds PowerShell script to install/uninstall MSI and verify installed binary.
Taskfile.yml	Adds Windows MSI packaging/install tasks for acceptance coverage.
nfpm.go	Adds MSI config structs and env-var expansion for MSI signing/manufacturer.
msi/msi.go	Implements the MSI packager (contents mapping, shortcuts, services, registry, signing).
msi/msi_test.go	Adds unit tests validating MSI structure, ICE checks, defaults, GUID derivation, and signing.
internal/cmd/root.go	Registers the MSI packager in the CLI via blank import.
go.mod	Adds dependencies for MSI generation and PKCS#12 support.
go.sum	Records checksums for newly added MSI-related dependencies.
files/files.go	Fixes an infinite loop when walking parent dirs for Windows drive-letter destinations.
files/files_test.go	Adds regression test for drive-letter destination termination.
acceptance_test.go	Adds an MSI acceptance test validating MSI CFB header and ICE findings.
.github/workflows/build.yml	Adds CI jobs for MSI structure validation (Linux) and install verification (Windows).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.