remove dockerfile linter from this repository

.github/workflows/lint-dockerfiles.yml

@@ -1,21 +0,0 @@
-name: Dockerfile Lint
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-  hadolint:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        dockerfile:
-          - docker/sia/Dockerfile
-    steps:
-      - uses: actions/checkout@v3
-      - uses: hadolint/hadolint-action@v2.0.0
-        with:
-          dockerfile: ${{ matrix.dockerfile }}