remove: forgejo runner

.forgejo/workflows/main.yml

@@ -1,74 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches:
-      - main
-    paths-ignore:
-      - "hosts/machine/kanade/**"
-  pull_request:
-    paths-ignore:
-      - "hosts/machine/kanade/**"
-
-jobs:
-  check:
-    runs-on: x86_64
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Check flake
-        run: |
-          source /etc/bashrc
-          nix flake check
-  ida:
-    runs-on: x86_64
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Prefetch IDA
-        run: |
-          source /etc/bashrc
-          nix-prefetch-url --type sha256 https://file.mizuki.guru/.ida/ida-free-pc_93_x64linux.run
-  cpt:
-    runs-on: x86_64
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Prefetch Cisco Packet Tracer
-        run: |
-          source /etc/bashrc
-          nix-prefetch-url --type sha256 https://file.mizuki.guru/.cpt/CiscoPacketTracer_900_Ubuntu_64bit.deb
-          nix-prefetch-url --type sha256 https://file.mizuki.guru/.cpt/CiscoPacketTracer822_amd64_signed.deb
-
-  build-nixos:
-    needs: check
-    runs-on: x86_64
-    strategy:
-      fail-fast: false
-      matrix:
-        host: [mizuki, ena, hako, kazusa]
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Build NixOS configuration with nom
-        run: |
-          source /etc/bashrc
-          nix build .#nixosConfigurations.${{ matrix.host }}.config.system.build.toplevel
-
-      - name: Cache & Push to Attic
-        if: success()
-        env:
-          ATTIC_SERVER: ${{ secrets.ATTIC_SERVER }}
-          ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
-        run: |
-          source /etc/bashrc
-          nix shell nixpkgs#attic-client -c bash -c "
-            attic login imnyang \"$ATTIC_SERVER\" \"$ATTIC_TOKEN\"
-            attic push imnyang ./result
-          "
-      - name: Clean Builder Environment
-        if: success()
-        run: |
-          nix-collect-garbage -d