Update dockerimage.yml

Author: grammy-jiang

.github/workflows/dockerimage.yml

@@ -14,7 +14,7 @@ jobs:
         run: docker build --tag scrapedia/privoxy:$(date +%s) --file Dockerfile .
         working-directory: versions/alpine
 
-  install shellcheck:
+  install_shellcheck:
 
     runs-on: ubuntu-latest