Add kubectl utility

Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:bookworm
 
+ARG KUBE_RELEASE=v1.30.2
+
 RUN set -eux; \
 	apt-get update; \
 	apt-get install -y --no-install-recommends \
@@ -21,7 +23,10 @@ RUN set -eux; \
 		docker-buildx-plugin \
 		docker-compose-plugin \
 	; \
+	curl --silent --location "https://dl.k8s.io/release/$KUBE_RELEASE/bin/linux/amd64/kubectl" \
+		| install --owner=root --group=root --mode=0755 /dev/stdin /usr/local/bin/kubectl \
+	; \
 	rm -rf /var/lib/apt/lists/*
 
 # References:
-# - docker: https://docs.docker.com/engine/install/debian/#install-from-a-package
+# - docker: https://docs.docker.com/engine/install/debian/#install-from-a-package

Readme.md

@@ -6,4 +6,5 @@ Common docker image used for running application builds, CI pipelines, and deplo
 
 - `docker`
 - `curl`
-- `git`
+- `git`
+- `kubectl`