Update .github/workflows/ci.yml

Author: jeffkala

.github/workflows/ci.yml

@@ -102,7 +102,7 @@ jobs:
         with:
           poetry-version: "2.1.3"
       - name: "Get image version"
-        run: "echo INVOKE_JDIFF_IMAGE_VER=`poetry version -s`-py$${{ matrix.python-version }} >> $GITHUB_ENV"
+        run: "echo INVOKE_JDIFF_IMAGE_VER=`poetry version -s`-py${{ matrix.python-version }} >> $GITHUB_ENV"
       - name: "Set up Docker Buildx"
         id: "buildx"
         uses: "docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2"  # v3.10.0