ci: checkout repo with full history in publish job

This is needed for `git describe` to extract the proper version,
including distance from latest tag.

.github/workflows/ci-earthly.yml

@@ -83,6 +83,8 @@ jobs:
           version: v0.8.8
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       # Needed for Earthly tagging to work
       - name: Put back the git branch into git
         run: |