Added an endpoint to test auth.

apps/images/src/__tests__/server.test.ts

apps/images/src/common/auth.ts

apps/images/src/render/index.ts

apps/images/src/server.ts

apps/images/test_setup/data/snips.json

apps/images/test_setup/data/tmp/1/1000.jpeg

apps/images/test_setup/data/tmp/1/1000.pdf

apps/images/test_setup/data/tmp/1/1200.jpeg

apps/images/test_setup/data/tmp/1/1200.pdf

apps/images/test_setup/data/tmp/1/1400.jpeg

apps/images/test_setup/data/tmp/1/1400.pdf

apps/images/test_setup/data/tmp/1/150.jpeg

apps/images/test_setup/data/tmp/1/200.jpeg

apps/images/test_setup/data/tmp/1/200.pdf

apps/images/test_setup/data/tmp/1/400.jpeg

apps/images/test_setup/data/tmp/1/400.pdf

apps/images/test_setup/data/tmp/1/600.jpeg

apps/images/test_setup/data/tmp/1/600.pdf

apps/images/test_setup/data/tmp/1/720.pdf

apps/images/test_setup/data/tmp/1/800.jpeg