Small Dockerfile.lambda fixups

Author: mckern

Dockerfile.lambda

@@ -1,12 +1,12 @@
 # Fetch or build all required binaries
-FROM golang:1.21 as builder
+FROM golang:1.21-bookworm as builder
 
 ARG VERSION_REF
 RUN test -n "${VERSION_REF}"
 
 ENV SRC github.com/segmentio/kubeapply
 
-RUN apt-get update && apt-get install --yes \
+RUN apt-get update && apt-get install --no-install-recommends --yes \
     curl \
     unzip \
     wget
@@ -16,24 +16,21 @@ RUN cd /usr/local/bin && /go/src/${SRC}/scripts/pull-deps.sh
 
 WORKDIR /go/src/${SRC}
 
-ENV CGO_ENABLED=1
-ENV GO111MODULE=on
-
 RUN make kubeapply VERSION_REF=${VERSION_REF} && \
     cp build/kubeapply /usr/local/bin
 RUN make kubeapply-lambda VERSION_REF=${VERSION_REF} && \
     cp build/kubeapply-lambda /usr/local/bin
 
-# Copy into final image
+# Copy into final image from builder
 FROM public.ecr.aws/lambda/provided:al2
 
 RUN yum install -y git unzip
 
 # Not sure if awscli is needed for running lambda, but keeping it here for now
 RUN curl https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip -o awscliv2.zip \
- && unzip awscliv2.zip \
- && ./aws/install \
- && rm -rf aws awscliv2.zip
+    && unzip awscliv2.zip \
+    && ./aws/install \
+    && rm -rf aws awscliv2.zip
 
 COPY --from=builder \
     /usr/local/bin/aws-iam-authenticator \