chore: env vars instead text

Author: vwency

.github/workflows/docker-builds.yaml

@@ -8,16 +8,15 @@ on:
 jobs:
 
   trigger-build:
-    uses: multi-repo/workflows/.github/workflows/kaniko-build.yaml@main
+    uses: "${{ github.repository_owner }}/workflows/.github/workflows/kaniko-build.yaml@main"
     with:
       image-name: ${{ github.repository }}/redis
     secrets:
       personal_access_token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
 
   trigger-cleanup:
-      uses: multi-repo/workflows/.github/workflows/clean-registry.yaml@main
+      uses: "${{ github.repository_owner }}/workflows/.github/workflows/clean-registry.yaml@main"
       with:
-        owner: multi-repo
         repository: redis 
         package: redis/redis
         keep_n_tagged: 2