build-deb.yml: Fetch whole history

Otherwise, git-describe(1) would fail and it would not be possible to
tag the artifacts accordingly.

.forgejo/workflows/build-deb.yml

@@ -9,7 +9,6 @@ jobs:
         run: |
           git clone -q \
             -b ${{ env.GITHUB_HEAD_REF }} \
-            --depth 1 \
             ${{ env.GITHUB_SERVER_URL }}/${{ env.GITHUB_REPOSITORY }}.git \
             /src
       - name: Configure project