🚀 [Feature]: Add PR-based release notes settings (#5)

The settings action now supports three new configuration options that
control how GitHub release notes are generated from pull requests.

- Relates to PSModule/Process-PSModule#263

## New settings schema

The following settings are now available in the `Publish.Module` section
of your `.github/PSModule.yml`:

| Setting | Type | Default | Description |
|---------|------|---------|-------------|
| `UsePRTitleAsReleaseName` | `boolean` | `false` | Use pull request
title as the GitHub release name |
| `UsePRBodyAsReleaseNotes` | `boolean` | `true` | Use pull request body
as the release notes content |
| `UsePRTitleAsNotesHeading` | `boolean` | `true` | Add pull request
title as H1 heading in release notes |

## Schema changes

The JSON schema in
[scripts/Settings.schema.json](scripts/Settings.schema.json) has been
updated to include the new properties with proper type definitions and
descriptions.

## Default values

The [scripts/main.ps1](scripts/main.ps1) file now outputs these settings
with sensible defaults:

- `UsePRTitleAsReleaseName`: `false` (release name uses version tag)
- `UsePRBodyAsReleaseNotes`: `true` (PR body becomes release notes)
- `UsePRTitleAsNotesHeading`: `true` (PR title appears as heading with
PR link)

Author: MariusStorhaug

scripts/Settings.schema.json

@@ -161,6 +161,18 @@
             "IgnoreLabels": {
               "type": "string",
               "description": "Comma-separated labels that prevent release"
+            },
+            "UsePRTitleAsReleaseName": {
+              "type": "boolean",
+              "description": "Use pull request title as the GitHub release name"
+            },
+            "UsePRBodyAsReleaseNotes": {
+              "type": "boolean",
+              "description": "Use pull request body as the release notes content"
+            },
+            "UsePRTitleAsNotesHeading": {
+              "type": "boolean",
+              "description": "Add pull request title as H1 heading in release notes"
             }
           }
         }

scripts/main.ps1

@@ -162,16 +162,19 @@ $settings = [pscustomobject]@{
     }
     Publish = [pscustomobject]@{
         Module = [pscustomobject]@{
-            Skip                  = $settings.Publish.Module.Skip ?? $false
-            AutoCleanup           = $settings.Publish.Module.AutoCleanup ?? $true
-            AutoPatching          = $settings.Publish.Module.AutoPatching ?? $true
-            IncrementalPrerelease = $settings.Publish.Module.IncrementalPrerelease ?? $true
-            DatePrereleaseFormat  = $settings.Publish.Module.DatePrereleaseFormat ?? ''
-            VersionPrefix         = $settings.Publish.Module.VersionPrefix ?? 'v'
-            MajorLabels           = $settings.Publish.Module.MajorLabels ?? 'major, breaking'
-            MinorLabels           = $settings.Publish.Module.MinorLabels ?? 'minor, feature'
-            PatchLabels           = $settings.Publish.Module.PatchLabels ?? 'patch, fix'
-            IgnoreLabels          = $settings.Publish.Module.IgnoreLabels ?? 'NoRelease'
+            Skip                     = $settings.Publish.Module.Skip ?? $false
+            AutoCleanup              = $settings.Publish.Module.AutoCleanup ?? $true
+            AutoPatching             = $settings.Publish.Module.AutoPatching ?? $true
+            IncrementalPrerelease    = $settings.Publish.Module.IncrementalPrerelease ?? $true
+            DatePrereleaseFormat     = $settings.Publish.Module.DatePrereleaseFormat ?? ''
+            VersionPrefix            = $settings.Publish.Module.VersionPrefix ?? 'v'
+            MajorLabels              = $settings.Publish.Module.MajorLabels ?? 'major, breaking'
+            MinorLabels              = $settings.Publish.Module.MinorLabels ?? 'minor, feature'
+            PatchLabels              = $settings.Publish.Module.PatchLabels ?? 'patch, fix'
+            IgnoreLabels             = $settings.Publish.Module.IgnoreLabels ?? 'NoRelease'
+            UsePRTitleAsReleaseName  = $settings.Publish.Module.UsePRTitleAsReleaseName ?? $false
+            UsePRBodyAsReleaseNotes  = $settings.Publish.Module.UsePRBodyAsReleaseNotes ?? $true
+            UsePRTitleAsNotesHeading = $settings.Publish.Module.UsePRTitleAsNotesHeading ?? $true
         }
     }
     Linter  = [pscustomobject]@{