CI: unshallow the runner's repo to get the version for building container

.forgejo/workflows/build.yaml

@@ -31,9 +31,13 @@ jobs:
       - name: Build package (transpile ts => js)
         run: ng build
 
-      - name: Get the version from git
-        id: version
+      - name: Git unshallow - get all history from Git to get the tag for the computation of the version
         if: ${{ inputs.build }}
+        run: git pull --unshallow
+
+      - name: Get the version from git
+        if: ${{ inputs.build }}
+        id: version
         run: echo "version=$(git describe --dirty --tags)" >> $GITHUB_OUTPUT
 
       - name: Build container