Custom.Script.Action.Template.xml

<pnp:Provisioning xmlns:pnp="http://schemas.dev.office.com/PnP/2015/12/ProvisioningSchema">
  <pnp:Preferences Generator="OfficeDevPnP.Core, Version=2.1.1602.0, Culture=neutral, PublicKeyToken=null">
    <pnp:Parameters>
      <pnp:Parameter Key="InfrastructureSiteUrl" Required="true" />
    </pnp:Parameters>
  </pnp:Preferences>
  <pnp:Templates ID="CONTAINER-REGISTER-USER-ACTION-SCRIPT">
    <pnp:ProvisioningTemplate ID="REGISTER-USER-ACTION-SCRIPT" Version="1">

      <pnp:CustomActions>
        <pnp:SiteCustomActions>
          <pnp:CustomAction Name="RegisterUserScript" Location="ScriptLink" Sequence="0" Rights="" ScriptSrc="{parameter:InfrastructureSiteUrl}/Style Library/Custom.Script.Action/Custom-Script-Action.js">
            <pnp:CommandUIExtension />
          </pnp:CustomAction>
        </pnp:SiteCustomActions>
      </pnp:CustomActions>

    </pnp:ProvisioningTemplate>
  </pnp:Templates>
</pnp:Provisioning>