set correct env variable for Dockerfile ARG

Author: anarchivist

.github/workflows/build.yml

@@ -71,7 +71,7 @@ jobs:
             BUILD_URL=${{ steps.set_build_url.outputs.build_url }}
             GIT_REF_NAME=${{ github.ref_name }}
             GIT_SHA=${{ github.sha }}
-            GIT_URL=${{ github.repositoryUrl }}
+            GIT_REPOSITORY_URL=${{ github.repositoryUrl }}
           cache-from: type=registry,ref=${{ steps.cache-meta.outputs.tags }}
           cache-to: type=registry,ref=${{ steps.cache-meta.outputs.tags }},mode=max
           labels: ${{ steps.build-meta.outputs.labels }}