fix(ci-action): install git in Dockerfile so lingo.dev ci works outside GitHub runners

  Closes #2074

Author: louisguitton

.changeset/fix-dockerfile-install-git.md

@@ -0,0 +1,5 @@
+---
+"lingo.dev": patch
+---
+
+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).

Dockerfile

@@ -1,5 +1,9 @@
 FROM node:20.12.2-alpine
 
+# git is required by `lingo.dev ci` (configureGit) and is not included in the
+# node:alpine base image.
+RUN apk add --no-cache git
+
 # Run the Node.js / TypeScript application
 ENTRYPOINT ["sh", "-c", "npx lingo.dev@latest ci \
   --api-key \"$LINGODOTDEV_API_KEY\" \