build(docker): Non tidy go mods fail image build (#1418)

fix(docker): Non tidy go mods fail image build

Dockerfile

@@ -3,7 +3,7 @@ FROM golang:alpine AS builder
 RUN apk --update add ca-certificates
 WORKDIR /app
 COPY . ./
-RUN go mod tidy
+RUN go mod tidy -diff
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gatus .
 
 # Run Tests inside docker image if you don't have a configured go environment