title: trying to add solidus to gemfile but having issues
body: <p>this is what im getting when i add solidus to gemfile</p>
  <p>Bundler could not find compatible versions for gem &quot;actionmailer&quot;:
  In snapshot (Gemfile.lock):
  actionmailer (= 7.0.2.3)</p>
  <p>In Gemfile:
  rails (~&gt; 7.0.2, &gt;= 7.0.2.3) was resolved to 7.0.2.3, which depends on
  actionmailer (= 7.0.2.3)</p>
  <pre><code>solidus was resolved to 2.5.0.beta1, which depends on
    solidus_core (= 2.5.0.beta1) was resolved to 2.5.0.beta1, which depends on
      actionmailer (~&gt; 5.1.0)
  </code></pre>
  <p>Running <code>bundle update</code> will rebuild your snapshot from scratch, using only
  the gems in your Gemfile, which may resolve the conflict.</p>
  <p>Bundler could not find compatible versions for gem &quot;rails&quot;:
  In snapshot (Gemfile.lock):
  rails (= 7.0.2.3)</p>
  <p>In Gemfile:
  rails (~&gt; 7.0.2, &gt;= 7.0.2.3)</p>
  <pre><code>solidus was resolved to 1.0.0.pre, which depends on
    solidus_core (= 1.0.0.pre) was resolved to 1.0.0.pre, which depends on
      rails (~&gt; 4.2.0)
  </code></pre>