Drop github CI

.github/workflows/build.yaml

@@ -1,44 +0,0 @@
-name: Build
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-  schedule:
-    - cron:  '30 0,6,12,18 * * *'
-  workflow_dispatch: {}
-
-env:
-  REGISTRY: ghcr.io
-
-permissions:
-  contents: read
-  packages: write
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        os: ["fedora", "c9s", "c9s-rt"]
-    container:
-      # Yes, we're using this as a *builder* image.
-      image: quay.io/fedora/fedora-coreos:stable
-      options: "--user root --privileged -v /var/tmp:/var/tmp -v /tmp:/tmp"
-    steps:
-      - uses: actions/checkout@v3
-        # https://github.com/actions/checkout/issues/760
-      - name: Mark git checkout as safe
-        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
-      - name: Install deps
-        run: rpm-ostree install distribution-gpg-keys
-      - name: Login
-        run: podman login --username ${{ github.actor }} --password ${{ secrets.GITHUB_TOKEN }} ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
-      # Make force triggering a build always build the image
-      - run: echo "force_initialize=1" >> $GITHUB_ENV
-        if: github.event_name == 'workflow_dispatch'
-      - name: Build ostree container
-        run: rpm-ostree compose image --format=registry ${force_initialize:+--initialize} ${{ matrix.os }}.yaml ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.os }}-oscore