Enhance include workflow with OSMF EULA support

Added OSMF EULA processing step and included 'osmfeula.txt' in paths for pull request creation.
This will replace the $product$ token in the eula with the current project's Product property, which is required if the EULA is in use.

Author: kzu

.github/workflows/includes.yml

@@ -7,6 +7,7 @@ on:
 paths:
  - '**.md'
  - '!changelog.md'
+ - 'osmfeula.txt'
 
 jobs:
 includes:
@@ -31,10 +32,29 @@ jobs:
  - name: +Mᐁ includes
 uses: devlooped/actions-includes@v1
 
+ - name: 📝 OSMF EULA
+shell: pwsh
+run: |
+ $file = "osmfeula.txt"
+ $props = "src/Directory.Build.props"
+ if (-not (test-path $file) -or -not (test-path $props)) {
+ exit 0
+ }
+
+ $product = dotnet msbuild $props -getproperty:Product
+ if (-not $product) { 
+ write-error "To use OSMF EULA, ensure the $(Product) property is set in Directory.props"
+ exit 1
+ }
+
+ (get-content -raw $file) -replace '\$product\$',$product | set-content $file
+
  - name: ✍ pull request
 uses: peter-evans/create-pull-request@v6
 with:
-add-paths: '**.md'
+add-paths: |
+ **.md
+ osmfeula.txt
 base: main
 branch: markdown-includes
 delete-branch: true