Add timestamp to kaniko builds

[VannTen]

What type of PR is this?
/kind feature

What this PR does / why we need it:
The build steps at the start of CI takes about 2 minutes; now that we
have greatly reduced the overall duration, this is not an insignificant
impact.

Add timestamps to the build process to see measure which steps of the
image build take the most time.

Special notes for your reviewer:
/label ci-short

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: VannTen

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• OWNERS [VannTen]

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[VannTen]

/retest

[VannTen]

INFO[2025-01-24T16:12:53Z] Using caching version of cmd: RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 1     && pip install --no-compile --no-cache-dir pip -U     && pip install --no-compile --no-cache-dir -r tests/requirements.txt     && pip install --no-compile --no-cache-dir -r requirements.txt     && KUBE_VERSION=$(sed -n 's/^kube_version: //p' roles/kubespray-defaults/defaults/main/main.yml)     && curl -L https://dl.k8s.io/release/$KUBE_VERSION/bin/linux/$(dpkg --print-architecture)/kubectl -o /usr/local/bin/kubectl     && echo $(curl -L https://dl.k8s.io/release/$KUBE_VERSION/bin/linux/$(dpkg --print-architecture)/kubectl.sha256) /usr/local/bin/kubectl | sha256sum --check     && chmod a+x /usr/local/bin/kubectl     && curl -LO https://releases.hashicorp.com/vagrant/${VAGRANT_VERSION}/vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && dpkg -i vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && rm vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && vagrant plugin install vagrant-libvirt     && pip install --no-compile --no-cache-dir kubernetes     && ansible-galaxy collection install kubernetes.core 
INFO[2025-01-24T16:12:53Z] Unpacking rootfs as cmd ADD ./requirements.txt  /kubespray/requirements.txt requires it. 
INFO[2025-01-24T16:12:54Z] ENV VAGRANT_VERSION=2.4.1     VAGRANT_DEFAULT_PROVIDER=libvirt     VAGRANT_ANSIBLE_TAGS=facts     LANG=C.UTF-8     DEBIAN_FRONTEND=noninteractive     PYTHONDONTWRITEBYTECODE=1 
INFO[2025-01-24T16:12:54Z] No files changed in this command, skipping snapshotting. 
INFO[2025-01-24T16:12:54Z] RUN apt update -q     && apt install -yq          libssl-dev          python3-dev          python3-pip          sshpass          apt-transport-https          jq          moreutils          libvirt-dev          openssh-client          rsync          git          ca-certificates          curl          gnupg2          software-properties-common          unzip          libvirt-clients          qemu-utils          qemu-kvm          dnsmasq     && curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -     && add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"     && apt update -q     && apt install --no-install-recommends -yq docker-ce     && apt autoremove -yqq --purge && apt clean && rm -rf /var/lib/apt/lists/* /var/log/* 
INFO[2025-01-24T16:12:54Z] Found cached layer, extracting to filesystem 
INFO[2025-01-24T16:13:47Z] WORKDIR /kubespray                           

INFO[2025-01-24T16:13:47Z] RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 1     && pip install --no-compile --no-cache-dir pip -U     && pip install --no-compile --no-cache-dir -r tests/requirements.txt     && pip install --no-compile --no-cache-dir -r requirements.txt     && KUBE_VERSION=$(sed -n 's/^kube_version: //p' roles/kubespray-defaults/defaults/main/main.yml)     && curl -L https://dl.k8s.io/release/$KUBE_VERSION/bin/linux/$(dpkg --print-architecture)/kubectl -o /usr/local/bin/kubectl     && echo $(curl -L https://dl.k8s.io/release/$KUBE_VERSION/bin/linux/$(dpkg --print-architecture)/kubectl.sha256) /usr/local/bin/kubectl | sha256sum --check     && chmod a+x /usr/local/bin/kubectl     && curl -LO https://releases.hashicorp.com/vagrant/${VAGRANT_VERSION}/vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && dpkg -i vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && rm vagrant_${VAGRANT_VERSION}-1_$(dpkg --print-architecture).deb     && vagrant plugin install vagrant-libvirt     && pip install --no-compile --no-cache-dir kubernetes     && ansible-galaxy collection install kubernetes.core 
INFO[2025-01-24T16:13:47Z] Found cached layer, extracting to filesystem 
INFO[2025-01-24T16:14:21Z] Pushing image to registry.gitlab.com/kargo-ci/kubernetes-sigs-kubespray/pipeline:1639973584-ccf05d9a 

Not sure if the cache extraction is taking that long, or if the log is wrong and it's actually running the RUN steps.