[9.0] Build duplicates of all installer packages for new signing keys

src/Microsoft.DotNet.Build.Tasks.Installers/build/installer.singlerid.targets

@@ -148,15 +148,22 @@
       <ExeBundleInstallerFile>$(PackageOutputPath)$(InstallerFileNameWithoutExtension).exe</ExeBundleInstallerFile>
       <ExeBundleInstallerEngineFile>$(PackageOutputPath)$(InstallerFileNameWithoutExtension)-engine.exe</ExeBundleInstallerEngineFile>
     </PropertyGroup>
+  </Target>
 
-    <PropertyGroup Condition="'$(GenerateRpm)' == 'true'">
-      <CreateRPMForCblMariner>true</CreateRPMForCblMariner>
-      <!-- PackageTargetOS is a distro-specific version suffix, used for deps packages, including the one for CBL Mariner.
-           We do not want to create additional CBL Mariner named RPMs of those packages. -->
-      <CreateRPMForCblMariner Condition="'$(PackageTargetOS)' != ''">false</CreateRPMForCblMariner>
-    </PropertyGroup>
-
-    <PropertyGroup Condition="'$(CreateRPMForCblMariner)' == 'true'">
+
+  <!--
+    Packages produced for CBL-Mariner must be signed with a special certificate.
+    Additionally, some distros use old keys (SHA-1 based) so there's a different cert for new packages.
+    RPM v4 doesn't support multiple signatures, so we must have two separate copies of the RPM for us to sign.
+    To solve this, we make copies of the packages with special names (which the Arcade SDK will sign with the correct certificate).
+    PackageTargetOS is a distro-specific version suffix, used for deps packages, including the one for CBL-Mariner.
+    As a result, we don't need to create a separate copy of the package for CBL-Mariner, but we do need to create a copy with the new key (unless the target is CBL-Mariner).
+  -->
+  <Target Name="_BuildMarinerRpm"
+          AfterTargets="GenerateRpm"
+          Condition="'$(PackageTargetOS)' != ''">
+    <!-- CBL-Mariner -->
+    <PropertyGroup>
       <!-- CBL-Mariner 1.0 -->
       <_CblMarinerVersionSuffix>cm.1</_CblMarinerVersionSuffix>
       <_InstallerBuildPartCblMariner>$(Version)-$(_CblMarinerVersionSuffix)-$(InstallerTargetArchitecture)</_InstallerBuildPartCblMariner>
@@ -168,6 +175,40 @@
       <_InstallerFileNameWithoutExtensionCblMariner2>$(InstallerName)-$(_InstallerBuildPartCblMariner2)$(CrossArchContentsBuildPart)</_InstallerFileNameWithoutExtensionCblMariner2>
       <_InstallerFileCblMariner2>$(PackageOutputPath)$(_InstallerFileNameWithoutExtensionCblMariner2)$(InstallerExtension)</_InstallerFileCblMariner2>
     </PropertyGroup>
+    <Copy SourceFiles="$(_InstallerFile)"
+          DestinationFiles="$(_InstallerFileCblMariner)"
+          OverwriteReadOnlyFiles="True"
+          SkipUnchangedFiles="False"
+          UseHardlinksIfPossible="False" />
+
+    <Message Text="$(MSBuildProjectName) -> $(_InstallerFileCblMariner)" Importance="high" />
+    <Copy SourceFiles="$(_InstallerFile)"
+          DestinationFiles="$(_InstallerFileCblMariner2)"
+          OverwriteReadOnlyFiles="True"
+          SkipUnchangedFiles="False"
+          UseHardlinksIfPossible="False" />
+
+    <Message Text="$(MSBuildProjectName) -> $(_InstallerFileCblMariner2)" Importance="high" />
+  </Target>
+
+  <Target Name="_BuildNewKeyLinuxPackage"
+          AfterTargets="GenerateRpm;GenerateDeb"
+          Condition="'$(PackageTargetOS)' != 'cm.1' and '$(PackageTargetOS)' != 'cm.2'">
+    <!-- Packages to be signed with the new key -->
+    <PropertyGroup>
+      <_NewKeyVersionSuffix>newkey</_NewKeyVersionSuffix>
+      <_InstallerBuildPartNewKey>$(Version)-$(_NewKeyVersionSuffix)-$(_InstallerArchSuffix)</_InstallerBuildPartNewKey>
+      <_InstallerBuildPartNewKey Condition="'$(PackageTargetOS)' != ''">$(Version)-$(PackageTargetOS)-$(_NewKeyVersionSuffix)-$(_InstallerArchSuffix)</_InstallerBuildPartNewKey>
+      <_InstallerFileNameWithoutExtensionNewKey>$(InstallerName)-$(_InstallerBuildPartNewKey)$(CrossArchContentsBuildPart)</_InstallerFileNameWithoutExtensionNewKey>
+      <_InstallerFileNewKey>$(PackageOutputPath)$(_InstallerFileNameWithoutExtensionNewKey)$(InstallerExtension)</_InstallerFileNewKey>
+    </PropertyGroup>
+    <Copy SourceFiles="$(_InstallerFile)"
+          DestinationFiles="$(_InstallerFileNewKey)"
+          OverwriteReadOnlyFiles="True"
+          SkipUnchangedFiles="False"
+          UseHardlinksIfPossible="False" />
+
+    <Message Text="$(MSBuildProjectName) -> $(_InstallerFileNewKey)" Importance="high" />
   </Target>
 
   <!--
@@ -330,26 +371,6 @@
           UseHardlinksIfPossible="False" />
 
     <Message Text="$(MSBuildProjectName) -> $(_InstallerFile)" Importance="high" />
-
-    <!-- CBL-Mariner 1.0 -->
-    <Copy Condition="'$(CreateRPMForCblMariner)' == 'true'"
-          SourceFiles="@(GeneratedRpmFiles)"
-          DestinationFiles="$(_InstallerFileCblMariner)"
-          OverwriteReadOnlyFiles="True"
-          SkipUnchangedFiles="False"
-          UseHardlinksIfPossible="False" />
-
-    <Message Text="$(MSBuildProjectName) -> $(_InstallerFileCblMariner)" Importance="high" />
-
-    <!-- CBL-Mariner 2.0 -->
-    <Copy Condition="'$(CreateRPMForCblMariner)' == 'true'"
-          SourceFiles="@(GeneratedRpmFiles)"
-          DestinationFiles="$(_InstallerFileCblMariner2)"
-          OverwriteReadOnlyFiles="True"
-          SkipUnchangedFiles="False"
-          UseHardlinksIfPossible="False" />
-
-    <Message Text="$(MSBuildProjectName) -> $(_InstallerFileCblMariner2)" Importance="high" />
   </Target>
 
   <Target Name="GetRpmInstallerJsonProperties"