feat: add API token authentication

Makefile

@@ -1,3 +1,4 @@
+SHELL := bash
 ARCH ?= arm64
 ADDR ?= 0.0.0.0:8080
 
@@ -10,10 +11,10 @@ build:
 	env GOOS=linux GOARCH=${ARCH} go build -o bin/rcond-${ARCH} ./cmd/rcond/main.go
 
 run:
-	bin/rcond-${ARCH} ${ADDR}
+	source .env && bin/rcond-${ARCH} ${ADDR}
 
 dev:
-	go run cmd/rcond/main.go ${ADDR}
+	RCOND_API_TOKEN=1234567890 go run cmd/rcond/main.go
 
 upload:
 	scp rcond-${ARCH} pi@rpi-40ac:/home/pi/rcond