only shrink Go binary

Signed-off-by: Brad Wadsworth <brad.wadsworth@eviden.com>

Dockerfile

@@ -1,7 +1,7 @@
 # We use the latest Go 1.x version unless asked to use something else.
 # The GitHub Actions CI job sets this argument for a consistent Go version.
 ARG GO_VERSION=1
-ARG BASE_IMAGE=debian:bookworm-slim
+ARG BASE_IMAGE=kcllang/kcl
 
 # Setup the base environment. The BUILDPLATFORM is set automatically by Docker.
 # The --platform=${BUILDPLATFORM} flag tells Docker to build the function using