refactor: simpler dockerfile builder

Signed-off-by: peefy <[email protected]>

Dockerfile

@@ -1,37 +1,26 @@
 ARG GO_VERSION=1.22
-ARG XX_VERSION=1.2.1
 
-FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx
-FROM --platform=$BUILDPLATFORM golang:${GO_VERSION} as builder
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION} as build
 
-# Copy the build utilities.
-COPY --from=xx / /
+COPY / /src
+WORKDIR /src
 
-ARG TARGETPLATFORM
-
-WORKDIR /workspace
-
-# copy modules manifests
-COPY go.mod go.mod
-COPY go.sum go.sum
-
-# cache modules
-RUN go mod download
-
-# copy source code
-COPY cmd/main.go cmd/main.go
-COPY api/ api/
-COPY internal/controller/ internal/controller/
+# The TARGETOS and TARGETARCH args are set by docker. We set GOOS and GOARCH to
+# these values to ask Go to compile a binary for these architectures. If
+# TARGETOS and TARGETOS are different from BUILDPLATFORM, Go will cross compile
+# for us (e.g. compile a linux/amd64 binary on a linux/arm64 build machine).
+ARG TARGETOS
+ARG TARGETARCH
 
 # build
 ENV CGO_ENABLED=0
-RUN xx-go build -a -o kcl-controller cmd/main.go
+RUN go build -a -o kcl-controller cmd/main.go
 
 FROM kcllang/kcl
 
 RUN apt-get update && apt-get install -y ca-certificates tini
 
-COPY --from=builder /workspace/kcl-controller /usr/local/bin/
+COPY --from=build /src/kcl-controller /usr/local/bin/
 
 # RUN addgroup -S controller && adduser -S controller -G controller
 RUN groupadd controller && useradd -g controller controller