Use git clone to ensure we have a full repo

Author: giacomofiorin

.github/workflows/version-maintenance.yml

@@ -12,13 +12,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - name: Checkout Colvars repo in full
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
+      - name: Clone Colvars repo
+        run: |
+          git clone git@github.com:Colvars/colvars
 
       - name: Checkout Wiki repo
         uses: actions/checkout@v5
+        working-directory: colvars
         with:
           repository: 'Colvars/colvars.wiki'
           path: 'wiki'
@@ -34,6 +34,7 @@ jobs:
           git config --global user.name "CI runner"
           
       - name: Update Wiki page that lists Colvars versions
+        working-directory: colvars
         run: |
           bash doc/print_engine_versions.sh > wiki/List-of-Colvars-versions-included-in-simulation-and-analysis-packages.md
           if ! git -C wiki diff --quiet ; then