CI: publish container with tag latest along with the version

.forgejo/workflows/test_and_build.yaml

@@ -100,7 +100,7 @@ jobs:
           build-args: |
             APP_VERSION=${{ steps.version.outputs.version }}
 
-      - name: Push the image to the registry
+      - name: Push the image to the registry (version tag)
         if: fromJSON(steps.builder.outputs.run)
         uses: actions/push-to-registry@v2
         with:
@@ -108,6 +108,14 @@ jobs:
           image: treetrail-backend
           tags: ${{ steps.version.outputs.version }}
 
+      - name: Push the image to the registry (latest tag)
+        if: fromJSON(steps.builder.outputs.run)
+        uses: actions/push-to-registry@v2
+        with:
+          registry: "docker://${{ vars.REGISTRY }}/${{ vars.ORGANISATION }}"
+          image: treetrail-backend
+          tags: latest
+
       - name: Install uv
         uses: astral-sh/setup-uv@v4
         with: