Fix make docker-build command (#3)

Author: Ben Du

Dockerfile

@@ -1,19 +1,15 @@
 # Build the manager binary
-FROM golang:1.15 as builder
+FROM golang:1.17 as builder
 
 WORKDIR /workspace
-# Copy the Go Modules manifests
-COPY go.mod go.mod
-COPY go.sum go.sum
+
+# Copy the Go Modules manifests, plus the source
+COPY . ./
+
 # cache deps before building and copying source so that we don't need to re-download as much
 # and so that source changes don't invalidate our downloaded layer
 RUN go mod download
 
-# Copy the go source
-COPY main.go main.go
-COPY pkg/api api/
-COPY pkg/controllers controllers/
-
 # Build
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager main.go