🗑️(ci) clean old deployment and ci

We move deployment stuff to a new repository. we don't need this
codeanymore

.github/workflows/helmfile-linter.yaml

@@ -1,22 +0,0 @@
-name: Helmfile lint
-run-name: Helmfile lint
-
-on:
-  pull_request:
-    branches:
-      - 'main'
-
-jobs:
-  helmfile-lint:
-    runs-on: ubuntu-latest
-    container:
-      image: ghcr.io/helmfile/helmfile:latest
-    steps:
-      -
-        uses: numerique-gouv/action-helmfile-lint@main
-        with:
-          app-id: ${{ secrets.APP_ID }}
-          age-key: ${{ secrets.SOPS_PRIVATE }}
-          private-key: ${{ secrets.PRIVATE_KEY }}
-          helmfile-src: "src/helm"
-          repositories: "impress,secrets"