feat(koolbox): add svu binary

svu is a cli that generates version numbers in a UNIX way, which allows
it to be used in combination with various tools, helping to reduce
overhead for changelogs and other things.

images/koolbox/Dockerfile

@@ -17,6 +17,9 @@ RUN curl -LO "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubec
 # Release CLI cache
 FROM registry.gitlab.com/gitlab-org/release-cli:latest@sha256:45af0719567c4d7f6204996fbfc25b00741d8ae14ed45c59010af938d3aa16a0 as release-cli
 
+# Semantic Version Util - svu - https://github.com/caarlos0/svu
+FROM ghcr.io/caarlos0/svu:v1.9.0 as svu
+
 # git-chglog cache
 FROM quay.io/git-chglog/git-chglog:0.15.1 as git-chglog
 
@@ -164,6 +167,7 @@ COPY --from=kubectl-krew /opt/krew/krew /usr/local/bin/kubectl-krew
 COPY --from=mdbook /usr/local/bin/mdbook /usr/local/bin/mdbook
 COPY --from=release-cli /usr/local/bin/release-cli /usr/local/bin/release-cli
 COPY --from=git-chglog /usr/local/bin/git-chglog /usr/local/bin/git-chglog
+COPY --from=svu /usr/local/bin/svu /usr/local/bin/svu
 
 RUN true \
     && echo "command -v kubectl-krew >/dev/null && export PATH=\"${KREW_ROOT:-$HOME/.krew}/bin:$PATH\"" >> /root/.bashrc \