Expose backend coverage in dev mode through web

Generate backend coverage in ci

docker/rootfs/etc/nginx/conf.d/dev.conf

@@ -6,6 +6,11 @@ server {
 		return 302 /api/;
 	}
 
+	root /app/backend;
+	location /api/coverage {
+		try_files /index.html /coverage.html;
+	}
+
 	location /api/ {
 		add_header                X-Served-By $host;
 		chunked_transfer_encoding off;

scripts/ci/test-backend

@@ -43,7 +43,9 @@ if [ "${1:-}" = "--inside-docker" ]; then
 	echo -e "${BLUE}❯ ${CYAN}Testing backend code${RESET}"
 	cd /app/backend
 	[ -z "$(go tool fix -diff ./internal)" ]
-	go test -json -cover ./internal/... | tparse
+	go test -json -cover -coverprofile="$DIR/../../coverage.out" ./internal/... | tparse
+	go tool cover -html="$DIR/../../coverage.out" -o "$DIR/../../coverage.html"
+	rm -f "$DIR/../../coverage.out"
 	golangci-lint -v run ./...
 else
 	# run this script from within docker