test: Add Docker container for testing [skip ci]

Makefile

@@ -0,0 +1,22 @@
+cmd := "bash"
+msg := ""
+IMAGE_NAME := actions-hugo-dev:latest
+DOCKER_BUILD := docker build . -t $(IMAGE_NAME) --file ./__tests__/Dockerfile
+DOCKER_RUN := docker run --rm -i -t -v ${PWD}:/repo -v ~/.gitconfig:/etc/gitconfig $(IMAGE_NAME)
+
+
+.PHONY: build
+build:
+	$(DOCKER_BUILD)
+
+.PHONY: run
+run:
+	$(DOCKER_RUN) $(cmd)
+
+.PHONY: test
+test:
+	$(DOCKER_RUN) npm test
+
+.PHONY: commit
+commit:
+	$(DOCKER_RUN) git commit -m "$(msg)"