use cache

Signed-off-by: walnuts1018 <r.juglans.1018@gmail.com>

Author: walnuts1018

Dockerfile

@@ -1,27 +1,16 @@
 # Build the manager binary
-FROM golang:1.21 AS builder
+FROM golang AS builder
 
 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 cmd/main.go cmd/main.go
-COPY api/ api/
-COPY internal/controller/ internal/controller/
-COPY internal/initplugins internal/initplugins 
-COPY util/ util/
+RUN --mount=type=cache,target=/go/pkg/mod/,sharing=locked \
+    --mount=type=bind,source=go.sum,target=go.sum \
+    --mount=type=bind,source=go.mod,target=go.mod \
+    go mod download -x
 
-# 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
-# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
-# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
-RUN CGO_ENABLED=0 go build -a -o manager cmd/main.go
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=bind,target=. \
+    CGO_ENABLED=0 go build -a -o manager cmd/main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details