x86_64: Make the test environment more customizable

- Collect all test related targets under the test- prefix.

- Add target to run test suite against a `make run` instance. The
  intended use-case is that you are testing out a new build with `make
  run`, and then realize that you want to run some tests.  With this
  change, it is now possible to run `make infix-run-check` from a
  separate terminal - which attaches to the running instance and runs
  the tests.

- Provide -sh targets to spawn interactive environments, which is
  useful during debugging.

- Allow the user to supply a custom suite or list of tests to be run
  by 9PM.

.github/workflows/build.yml

@@ -61,7 +61,7 @@ jobs:
       - name: Test
         if: matrix.platform == 'x86_64' && matrix.variant == 'netconf'
         run: |
-          make infix-check
+          make test-qeneth
       - name: Prepare Artifact
         run: |
           cd output

.github/workflows/regression.yml

@@ -41,4 +41,4 @@ jobs:
           make
       - name: Regression Test
         run: |
-          make infix-check
+          make test-qeneth

board/x86_64/board.mk

@@ -1,8 +1,28 @@
-test-dir = $(BR2_EXTERNAL_INFIX_PATH)/test
+test-dir := $(BR2_EXTERNAL_INFIX_PATH)/test
+INFIX_TESTS ?= $(test-dir)/case/all.yaml
 
-.PHONY: infix-check
-infix-check:
-	$(test-dir)/env \
-		-q $(test-dir)/virt/dual \
-		-f $(BINARIES_DIR)/infix-x86_64.img \
-		$(BR2_EXTERNAL_INFIX_PATH)/9pm/9pm.py $(test-dir)/case/all.yaml
+test-env = $(test-dir)/env \
+	-f $(BINARIES_DIR)/infix-x86_64.img \
+	$(1) $(2)
+
+test-env-qeneth = $(call test-env,-q $(test-dir)/virt/dual,$(1))
+test-env-run    = $(call test-env,-C -t $(BINARIES_DIR)/qemu.dot,$(1))
+
+.PHONY: test-%
+
+test-qeneth:
+	$(call test-env-qeneth,\
+		$(BR2_EXTERNAL_INFIX_PATH)/9pm/9pm.py \
+			$(INFIX_TESTS))
+test-qeneth-sh:
+	$(call test-env-qeneth,/bin/sh)
+
+test-run: | ~/.infix-test-venv
+	$(call test-env-run,\
+		$(BR2_EXTERNAL_INFIX_PATH)/9pm/9pm.py \
+			$(INFIX_TESTS))
+test-run-sh:
+	$(call test-env-run,/bin/sh)
+
+~/.infix-test-venv:
+	$(test-dir)/docker/init-venv.sh $(test-dir)/docker/pip-requirements.txt