Forgot to add REGISTRY url. Minor environment variable tweaks.

.gitea/workflows/build.yaml

@@ -14,9 +14,8 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY_USER: ${{ github.repository_owner }}
-  REPO_URL: https://davejansen.dev/${{ github.repository_owner }}/${{
-    github.event.repository.name }}
+  REGISTRY: ${{ REGISTRY || 'davejansen.dev' }}
+  REGISTRY_USER: ${{ REGISTRY_USER || github.actor }}
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}-${{
@@ -58,7 +57,7 @@ jobs:
       - name: Login to Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.IMAGE_REGISTRY }}
+          registry: ${{ env.REGISTRY }}
           username: ${{ env.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_TOKEN }}