Use official KeePass for ReleaseDll

The .dll build with ReleaseDll will fail to load in KeePass because the
NuGet KeePass is an unofficial debug build and is not strongly versioned
(lacks public key token). So we have to build against the official
signed KeePass version.

.github/workflows/build.yml

@@ -12,7 +12,10 @@ jobs:
       with:
         submodules: true
 
-    - run: nuget restore
+    - name: Install prerequisites
+      run: |
+        choco install keepass.install
+        nuget restore
 
     - name: Setup MSBuild.exe
       uses: microsoft/setup-msbuild@v1.1

KeeAgent/KeeAgent.csproj

@@ -254,7 +254,7 @@
     <None Include="Resources\help-3.png" />
   </ItemGroup>
   <ItemGroup Condition=" '$(OS)' != 'Unix' ">
-    <PackageReference Include="KeePass">
+    <PackageReference Include="KeePass" ExcludeAssets="Compile" GeneratePathProperty="true">
       <Version>2.53.0.21099</Version>
       <ExcludeFromPlgx />
     </PackageReference>
@@ -269,6 +269,18 @@
       <ExcludeFromPlgx />
     </PackageReference>
   </ItemGroup>
+  <ItemGroup Condition=" '$(OS)' != 'Unix' and '$(Configuration)' == 'ReleaseDll' ">
+    <Reference Include="KeePass">
+      <HintPath>$(ProgramW6432)\KeePass Password Safe 2\KeePass.exe</HintPath>
+      <ExcludeFromPlgx />
+    </Reference>
+  </ItemGroup>
+  <ItemGroup Condition=" '$(OS)' != 'Unix' and '$(Configuration)' != 'ReleaseDll' ">
+    <Reference Include="KeePass">
+      <HintPath>$(PkgKeePass)\lib\net462\KeePass.exe</HintPath>
+      <ExcludeFromPlgx />
+    </Reference>
+  </ItemGroup>
   <ItemGroup Condition=" '$(OS)' == 'Unix' ">
     <Reference Include="KeePass">
       <HintPath>/usr/lib/keepass2/KeePass.exe</HintPath>