title: bind source path does not exist: /host_mnt
body: <p>I have a ddev installation on macOS which I used for a while.</p>
  <p>ddev 1.16.2</p>
  <p>docker 20.10.0</p>
  <p>macOS 11.0.1 - Intel</p>
  <p>Today I upgraded to docker 20.10.0 and in the process to ddev 1.16.2.</p>
  <p>When I start an existing site, that worked all the time I get</p>
  <pre><code>Creating ddev-mysite-db ... error
   
  ERROR: for ddev-mysite-db  Cannot create container for service db: invalid mount config for type &quot;bind&quot;: bind source path does not exist: /host_mnt/Users/me/Documents/Development/WebSite/mysite/.ddev 
  </code></pre>
  <p>This started to happen after I upgraded docker from the previous version. Upgrading ddev did not change too much.</p>
  <p>Even when I create a new site, the same error message pops up so I am pretty much stuck.</p>
  <p>At least for me it looks like the docker 20.10.0 breaks ddev. Any ideas how to deal with that are very much appreciated.</p>