fix(ci-action): install git in Dockerfile

[louisguitton]

Summary

Install git in the lingodotdev/ci-action Docker image so lingo.dev ci works in runners that do not already provide it (e.g. GitLab CI using the image directly).

Changes

• Dockerfile: add RUN apk add --no-cache git after the node:20.12.2-alpine base image.
• .changeset/fix-dockerfile-install-git.md: patch-level changeset for the lingo.dev package.

Testing

Business logic tests added:

• N/A — Dockerfile-only change. No existing image-level test harness in the repo, and there is no CLI code path to unit-test.
• Verified locally by building the image and running lingo.dev ci:

  docker build -t ci-action-local .
  docker run --rm -v "$PWD:/work" -w /work ci-action-local \
    sh -c 'git --version && npx lingo.dev@latest ci --help'
  Before the change: /bin/sh: git: not found, exit 127.
  After the change: git version 2.x and the CLI help prints.
  
  

Visuals

• N/A — no UI surface.

Checklist

• Changeset added (if version bump needed)
• Tests cover business logic (not just happy path)
• No breaking changes (or documented below)

Closes #2074

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[louisguitton]

waiting for the issue to be assigned to me :) then I'll mark the PR ready