Fix typo (#19)

Author: daniel-kurzynski

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
       run: |
         docker build --build-arg=BASE_IMAGE_TAG=${{ matrix.base-image-tag }} --tag ppiper/node-browsers:${{ matrix.base-image-tag }} .
     - name: Tag latest image
-      if: ${{ matrix.base-image-tag == 10-buster }}
+      if: ${{ matrix.base-image-tag == '10-buster' }}
       run: docker tag ppiper/node-browsers:${{ matrix.base-image-tag }} ppiper/node-browsers:latest
     - name: Push
       if: ${{ github.ref == 'ref/head/master' }}