title: Can't install DataDog MSI in Dockerfile
body: <p>From everything I have read, I should be able to do this:</p>
  <pre><code>FROM mcr.microsoft.com/windows/servercore:ltsc2019
  
  SHELL [&quot;powershell&quot;, &quot;-Command&quot;, &quot;$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';&quot;]
  
  ADD https://ddagent-windows-stable.s3.amazonaws.com/datadog-agent-7-latest.amd64.msi C:\datadog-agent-7-latest.amd64.msi
  RUN Start-Process msiexec.exe -Wait -ArgumentList '/qn /i C:\datadog-agent-7-latest.amd64.msi APIKEY=abc123 /L*V C:\install.log'
  </code></pre>
  <p>It looks like it built correctly:</p>
  <pre><code>&gt; docker build -t test .
  Sending build context to Docker daemon  4.608kB
  Step 1/4 : FROM mcr.microsoft.com/windows/servercore:ltsc2019
   ---&gt; 71d3f266f3af
  Step 2/4 : SHELL [&quot;powershell&quot;, &quot;-Command&quot;, &quot;$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';&quot;]
   ---&gt; Running in 1d931a586756
  Removing intermediate container 1d931a586756
   ---&gt; 277770d39d39
  Step 3/4 : ADD https://ddagent-windows-stable.s3.amazonaws.com/datadog-agent-7-latest.amd64.msi C:/datadog-agent-7-latest.amd64.msi
  Downloading [==================================================&gt;]  146.9MB/146.9MB
   ---&gt; 93223b61dad3
  Step 4/4 : RUN Start-Process msiexec.exe -Wait -ArgumentList '/qn /i C:\datadog-agent-7-latest.amd64.msi APIKEY=&quot;abc123&quot; /L*V C:\install.log'
   ---&gt; Running in 619d7bb20f3b
  Removing intermediate container 619d7bb20f3b
   ---&gt; ddc461e4525a
  Successfully built ddc461e4525a
  Successfully tagged test:latest
  </code></pre>
  <p>But when I check in the container to see if it installed in <code>C:\Program Files\Datadog</code>, I am not seeing any of the files I am expecting from the installation.</p>
  <p>I added the flag to give the install some extra logs (/L*V C:\install.log) but didn't see much in there. I have confirmed the msiexec command works on a Windows host, just not in the Docker build from what I can tell. Is there something simple that I'm missing?</p>