fix: wire in config_file (and update the example to match)

[jbedard]

Fix #108
Close #109

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Fix config file not being applied

Test plan

• Covered by existing test cases

[aspect-workflows]

Test

1 test target passed

Targets

//examples/minify:minified_diff_test [k8-fastbuild] 27ms

Total test execution time was 27ms. 10 tests (90.9%) were fully cached saving 855ms.

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Test

e2e/smoke

1 test target passed

Targets

//:minified_diff_test [k8-fastbuild]                37ms

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