[repo] Include license files in packages (#5192)

OpenTelemetry.sln

@@ -15,12 +15,12 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		.github\workflows\ci-concurrency.yml = .github\workflows\ci-concurrency.yml
 		CONTRIBUTING.md = CONTRIBUTING.md
 		global.json = global.json
-		LICENSE = LICENSE
 		NuGet.config = NuGet.config
+		LICENSE.TXT = LICENSE.TXT
 		OpenTelemetry.proj = OpenTelemetry.proj
 		README.md = README.md
-		THIRD-PARTY-NOTICES = THIRD-PARTY-NOTICES
 		VERSIONING.md = VERSIONING.md
+		THIRD-PARTY-NOTICES.TXT = THIRD-PARTY-NOTICES.TXT
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{7CB2F02E-03FA-4FFF-89A5-C51F107623FD}"

build/Common.prod.props

@@ -13,13 +13,15 @@
     <PackageTags>Observability;OpenTelemetry;Monitoring;Telemetry;Tracing;Metrics;Logging</PackageTags>
     <PackageIcon>opentelemetry-icon-color.png</PackageIcon>
     <PackageProjectUrl>https://opentelemetry.io</PackageProjectUrl>
-    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <Authors>OpenTelemetry Authors</Authors>
     <Copyright>Copyright The OpenTelemetry Authors</Copyright>
-    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackageOutputPath Condition="$(Build_ArtifactStagingDirectory) != ''">$(Build_ArtifactStagingDirectory)</PackageOutputPath>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
+    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <PackagePrimaryLicenseFile>$(RepoRoot)\LICENSE.TXT</PackagePrimaryLicenseFile>
+    <PackageThirdPartyNoticesFile>$(RepoRoot)\THIRD-PARTY-NOTICES.TXT</PackageThirdPartyNoticesFile>
   </PropertyGroup>
 
   <PropertyGroup Label="SourceLinkProperties">

src/Directory.Build.targets

@@ -19,4 +19,15 @@
     <Using Remove="System.Net.Http" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(IsPackable)' == 'true'">
+    <None Include="$(PackagePrimaryLicenseFile)"
+          PackagePath="$([System.IO.Path]::GetFileName('$(PackagePrimaryLicenseFile)'))"
+          Pack="true"
+          Visible="false" />
+    <None Include="$(PackageThirdPartyNoticesFile)"
+          PackagePath="$([System.IO.Path]::GetFileName('$(PackageThirdPartyNoticesFile)'))"
+          Pack="true"
+          Visible="false" />
+  </ItemGroup>
+
 </Project>