CI: GitHub: rm Nixpkgs-Linux-additional

Removing optional informational sake tests.

GHC version Cabal Hackage tests were added

.github/workflows/Nixpkgs-Linux-additional.yml

@@ -1,66 +0,0 @@
-name: "Nixpkgs, Linux, additional"
-
-
-on:
-  # On Git changes in PR
-  pull_request:
-  # On Git changes of the master
-  push:
-    branches:
-      - master
-  schedule:
-    # Every day at 03:45
-    - cron: "45 06 * * *"
-
-
-env:
-  rev: "nixos-unstable"
-  cachixAccount: "hnix"
-  CACHIX_SIGNING_KEY: ${{ secrets.CACHIX_SIGNING_KEY }}
-  linkWithGold: "true"
-
-
-jobs:
-
-  build40:
-    name: "Nixpkgs-unstable channel, default GHC (8.8)"
-    runs-on: ubuntu-latest
-    continue-on-error: true
-    env:
-      rev: "nixpkgs-unstable"
-    steps:
-    - name: Git checkout
-      uses: actions/checkout@v2
-      with:
-        submodules: recursive
-    - name: Install Nix
-      uses: cachix/install-nix-action@v10
-    - name: Install Cachix
-      uses: cachix/cachix-action@v6
-      with:
-        name: ${{ env.cachixAccount }}
-        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - name: Determined Nix-build
-      run: ./build.sh
-
-
-  build50:
-    name: "NixOS-unstable channel, GHC 8.6.5"
-    runs-on: ubuntu-latest
-    continue-on-error: true
-    env:
-      compiler: "ghc865"
-    steps:
-    - name: Git checkout
-      uses: actions/checkout@v2
-      with:
-        submodules: recursive
-    - name: Install Nix
-      uses: cachix/install-nix-action@v10
-    - name: Install Cachix
-      uses: cachix/cachix-action@v6
-      with:
-        name: ${{ env.cachixAccount }}
-        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - name: Determined Nix-build
-      run: ./build.sh