copy all files in project rather than piece by piece (kubernetes-sigs#765)

Author: kannon92

Dockerfile

@@ -6,18 +6,8 @@ FROM --platform=${BUILDPLATFORM} ${BUILDER_IMAGE} AS builder
 ARG TARGETARCH
 
 WORKDIR /workspace
-# Copy the Go Modules manifests
-COPY go.mod go.mod
-COPY go.sum go.sum
-# 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 api/ api/
-COPY pkg/ pkg/
 
+COPY . .
 # Build
 # the GOARCH has not a default value to allow the binary be built according to the host where the command
 # was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO