fix infra build

Author: nicktrn

.github/workflows/publish-infra.yml

@@ -60,7 +60,7 @@ jobs:
           if [[ "${{ github.ref_type }}" == "tag" ]]; then
             if [[ "${{ github.ref_name }}" == infra-*-* ]]; then
               env=$(echo ${{ github.ref_name }} | cut -d- -f2)
-              sha=${${{ github.sha }}::7}
+              sha=$(echo ${{ github.sha }} | head -c7)
               ts=$(date +%s)
               image_tag=${env}-${sha}-${ts}
             elif [[ "${{ github.ref_name }}" == v.docker.* ]]; then