add support for full_refresh in template_fields

[mvdh98]

Summary

• Adds full_refresh to template_fields on DbtRunOperator, DbtSeedOperator, DbtCompileOperator, and DbtBuildOperator, enabling Jinja templating in DAG definitions.
• Adds string-to-bool coercion in TableMutabilityConfig.__post_init__ to handle Airflow rendering full_refresh as a string after template resolution.

Example usage

DbtRunOperator(                        
    task_id="dbt_run",                                                                                                                                                                                  
    full_refresh="{{ params.full_refresh }}",
)

Test plan

• Added test_full_refresh_in_template_fields for each of the 4 operators
• Added test_full_refresh_templated for each of the 4 operators
• Added test_table_mutability_config_full_refresh_string_coercion for string-to-bool coercion
• Verified existing tests still pass

Development Approach

• First added the tests and verified they failed
• Then made the code changes
• Then verified the tests now succeed and any already existing tests still succeed

[mvdh98]

@tomasfarias could you have a look at this one? :)

[tomasfarias]

@mvdh98 Thanks for the PR! I will do a more thorough review later, but for now I'll let CI run the tests.

[tomasfarias]

Pretty good work! I have a few questions, but overall great, shouldn't take too much more work to get it merged.

[tomasfarias]

CI seems a bit flaky today, but the failures do not seem to be related to this PR. Retrying seems to help.

[tomasfarias]

@mvdh98 One final question: May I ask for the motivation for this change? Just curious as to know in case there is more work for us to do here. Did you encounter a situation in which this feature would have been useful?

Thanks!

[mvdh98]

@mvdh98 One final question: May I ask for the motivation for this change? Just curious as to know in case there is more work for us to do here. Did you encounter a situation in which this feature would have been useful?

Thanks!

The full_refresh parameter wasn't included in template_fields, which meant it couldn't be set dynamically using Jinja templates in DAG definitions. This change allows users to control full_refresh at runtime — for example, triggering a DAG run with full_refresh=True via params without needing a separate operator or DAG for full refresh runs. I needed this functionality to be able to do ad hoc full refresh runs from the airflow UI, using the same DAG.

[tomasfarias]

I needed this functionality to be able to do ad hoc full refresh runs from the airflow UI, using the same DAG.

Thanks! This is what I was looking for. I see the use case now: Have the same DAG running continuously for incremental runs, and have the option to full-refresh when required via the UI.

Cool!

I'll re-run the tests and if everything is green will merge & release this.