chore(workflow): remove delete tag workflow

.github/workflows/delete-docker-tag.yml

@@ -1,26 +0,0 @@
-name: Delete Docker tag
-
-on:
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: 'Tag to delete (e.g. 2.10.0)'
-        required: true
-
-jobs:
-  delete-tag:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Delete tag from Docker Hub
-        run: |
-          TOKEN=$(curl -s -X POST \
-            -H "Content-Type: application/json" \
-            -d '{"username":"${{ secrets.DOCKERHUB_USERNAME }}","password":"${{ secrets.DOCKERHUB_TOKEN }}"}' \
-            https://hub.docker.com/v2/users/login | jq -r .token)
-
-          STATUS=$(curl -s -o /dev/null -w "%{http_code}" -X DELETE \
-            -H "Authorization: JWT ${TOKEN}" \
-            "https://hub.docker.com/v2/repositories/mauriceboe/trek/tags/${{ inputs.tag }}/")
-
-          echo "Response: $STATUS"
-          [ "$STATUS" = "204" ] && echo "Tag deleted." || echo "Failed (HTTP $STATUS)."