containerize and add basic setup to backend

backend/Justfile

@@ -1,6 +1,21 @@
-build:
-	go build -o .build/nuchat fergus.molloy.xyz/nuchat 
+GO_TEST := "gotestsum --format=testname --"
+
+dirs: 
+	@mkdir -p .build/tests
+
+build: dirs
+	go build -o .build/nuchat fergus.molloy.xyz/nuchat
 
 run: build
 	./.build/nuchat
 
+test: unit integration coverage
+
+integration:
+	{{GO_TEST}} ./tests/... | tee .build/tests/integration.log
+
+unit:
+	{{GO_TEST}} -race $(go list ./... | grep -v "/tests") | tee .build/tests/unit.log
+
+coverage:
+	{{GO_TEST}} $(go list ./... | grep -v "/tests") -coverprofile .build/tests/coverprofile.txt | tee .build/tests/coverage.log