Environment (Required on creation):

Camunda Run 7.17

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

Despite what is said in the documentation (https://docs.camunda.org/manual/7.16/user-guide/process-engine/templating/#install-a-template-engine), FreeMarker is not shipped with Camunda Run.

Running an instance for a process definition with a freemarker script then fails with  

Can't find scripting engine for 'freemarker': scriptEngine is null

Steps to reproduce (Required on creation):

• Download and extract Camunda Run (or pull the docker image and start a container)
• Start Camunda Run
• Deploy a model with a script with freemarker scriptFormat

• <camunda:script scriptFormat="freemarker">Wow! ${coin} price is now at ${spotPrice} ${fiat}.</camunda:script> 

• Run an instance
• --> It fails with above error

Observed Behavior (Required on creation):

• FreeMarker is not shipped with Camunda Run

Expected behavior (Required on creation):

• FreeMarker should be shipped with Camunda Run OR documentation should be updated (but this is discouraged as many examples on our blog and docs refer to FreeMarker templates)