MILAB-6435: bump hook image base to ubuntu 24.04 LTS

[xnacly]

Bumps the integration-tests hook image base from the EOL ubuntu:20.04 to ubuntu:24.04.

What

• docker/hook/Dockerfile: both stages (aws-installer + final) move to ubuntu:24.04.

Verification (local)

• Image builds clean on 24.04.
• aws --version -> aws-cli/2.35.5 ... exe/x86_64.ubuntu.24.
• shasum --version -> 6.04 (libdigest-sha-perl installs fine).
• Entrypoint unchanged: missing script skips with exit 0, real script executes.

Follow-up

The image rebuilds via 0-build-docker.yaml (push to master / manual dispatch) producing a new :<sha> tag. Consuming repos must update their pinned hook-image hash for the bump to take effect there.

Other ubuntu bases

Checked docker/: hook was the only Ubuntu base. git-crypt (alpine) and nginx-spa (nginx-alpine) need no change.

Greptile Summary

Bumps the hook Docker image base from the EOL ubuntu:20.04 to the current LTS ubuntu:24.04 across both build stages (aws-installer and final). No functional changes were made to the entrypoint, installed packages, or AWS CLI installation steps.

• Both FROM lines are updated in lockstep, keeping the build consistent between the installer stage and the final image.
• libdigest-sha-perl and the AWS CLI bundled installer are confirmed to work correctly on 24.04 per local verification in the PR description.

Confidence Score: 4/5

Safe to merge — the change is a straightforward OS version bump with no logic modifications and local verification already done.

The Dockerfile change is minimal and correct: both build stages consistently move to ubuntu:24.04, and the package list and entrypoint are untouched.

No files require special attention.

Important Files Changed

Filename	Overview
docker/hook/Dockerfile	Both build stages bump from ubuntu:20.04 to ubuntu:24.04; entrypoint and package list are unchanged.

_{Reviews (1): Last reviewed commit: "MILAB-6435: bump hook image base to ubun..." | Re-trigger Greptile}

[notion-workspace]

[infra]: Bump all ubuntu 22 to 24 LTS