workflow: ensure "make test" builds externals and use in workflow

This commit ensures that externals are build during the tests and
that the GH action will test with externals too.

This is slightly hacky as it requires the network. Eventually we
can pull in externals via build-deps or vendor them but for now
this unblocks the otk work.

.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install .[dev]
       - name: Run unit tests
-        run: PYTHONPATH=./src pytest
+        run: PYTHONPATH=./src make test
       - name: Validate OTK configuration
         run: |
           for f in example/*/*.yaml; do

Makefile

@@ -20,7 +20,7 @@ format:
 	@find src test -name '*.py' | xargs autopep8 --in-place
 
 .PHONY: test
-test:
+test: external
 	@pytest
 
 .PHONY: push-check