fix: Correct use env variables

.github/workflows/CI.yml

@@ -83,7 +83,7 @@ jobs:
         if: success()
         with:
           url: '${{ vars.NTFY_URL }}'
-          title: Workflow success for ${GITHUB_REPOSITORY}
+          title: Workflow success for ${{ env.GITHUB_REPOSITORY }}
           topic: 'ci-status'
           priority: 4
           tags: +1,partying_face,action,successfully,completed
@@ -98,7 +98,7 @@ jobs:
         if: failure()
         with:
           url: '${{ vars.NTFY_URL }}'
-          title: Workflow failed for ${GITHUB_REPOSITORY}
+          title: Workflow failed for ${{ env.GITHUB_REPOSITORY }}
           topic: 'ci-status'
           priority: 5
           tags: -1,skull,action,failed