Add tests for nginx.conf directives (#1)

Adds tests to make sure all the `nginx.conf` directives (the redirects and rewrites and such) are all correct.

- Uses the `busted` framework
- The tests are run in a Docker container by the bash script `test.sh`
- Self-signed certs are generated in `Dockerfile` for all the domain names
- Adds new `Makefile` commands: `test`, `image-build` and `image-rm`

Reviewed-on: #1
Co-authored-by: Catalin Mititiuc <webdevcat@proton.me>
Co-committed-by: Catalin Mititiuc <webdevcat@proton.me>

Makefile

@@ -1,9 +1,19 @@
+image = miti.sh
+
 run:
-	docker run --rm -it --init -v $(PWD):/opt/app -p 8080:8080 \
-		sitegen-openresty
+	docker run --rm -it --init -v $(PWD):/opt/app -p 8080:80 $(image)
 
 build:
-	docker run --rm -w /opt/app -v $(PWD):/opt/app sitegen-openresty sitegen
+	docker run --rm -w /opt/app -v $(PWD):/opt/app $(image) sitegen
+
+image-rm:
+	docker image rm $(image):latest
+
+image-build:
+	docker build -t $(image) .
 
 lint:
-	docker run --rm -w /opt/app -v $(PWD):/opt/app sitegen-openresty moonc -l .
+	docker run --rm -w /opt/app -v $(PWD):/opt/app $(image) moonc -l .
+
+test:
+	./test.sh