Limit the number of initial build targets

- Start-off with just two build targets.
- Cachix is pending subscription, remove the cachix cache while we
  don't have it yet. We'll add it back later.
- Rename the cachix authentication token. We don't have the token yet,
  but once we do, we'll add it by the name of 'CACHIX_AUTH_TOKEN '.
- Remove 'workflow_dispatch' event from the workflow triggers, to
  not allow manually re-triggering the action.

Signed-off-by: Henri Rosten <henri.rosten@unikie.com>

.github/workflows/nix-build-matrix.yml

@@ -4,7 +4,6 @@ on:
   pull_request:
     branches:
       - main
-  workflow_dispatch:
 
 jobs:
   build_matrix:
@@ -14,16 +13,10 @@ jobs:
     strategy:
       matrix:
         include:
-          - arch: x86_64-linux
-            target: generic-x86_64-debug
           - arch: x86_64-linux
             target: lenovo-x1-carbon-gen11-debug
           - arch: x86_64-linux
             target: nvidia-jetson-orin-agx-debug-nodemoapps-from-x86_64
-          - arch: x86_64-linux
-            target: nvidia-jetson-orin-nx-debug-nodemoapps-from-x86_64
-          - arch: riscv64-linux
-            target: microchip-icicle-kit-debug
     steps:
       - name: Maximize space available on rootfs
         # Why not use https://github.com/easimon/maximize-build-space directly?
@@ -62,8 +55,8 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
         with:
           extra-conf: |
-            trusted-public-keys = ghaf-dev.cachix.org-1:IxMRy9D4TCXA/57XvtU0xrcEC0ErsnLvxJfPQe8O9pc= cache.vedenemo.dev:RGHheQnb6rXGK5v9gexJZ8iWTPX6OcSeS56YeXYzOcg= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-            substituters = https://ghaf-dev.cachix.org?priority=20 https://cache.vedenemo.dev https://cache.nixos.org
+            trusted-public-keys = cache.vedenemo.dev:RGHheQnb6rXGK5v9gexJZ8iWTPX6OcSeS56YeXYzOcg= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+            substituters = https://cache.vedenemo.dev https://cache.nixos.org
             system-features = nixos-test benchmark big-parallel kvm
             system = ${{ env.NIX_SYSTEM }}
       - name: Print nix.conf
@@ -79,12 +72,12 @@ jobs:
           cachix --version
       - name: Build ${{ matrix.arch }}.${{ matrix.target }}
         run: |
-          if [ "${{ secrets.CACHIX_AUTH_GHAF_DEV }}" = "" ]; then
+          if [ "${{ secrets.CACHIX_AUTH_TOKEN }}" = "" ]; then
             echo "Running nix build, no cachix push"
             time nix build .#packages.${{ matrix.arch }}.${{ matrix.target }}
             echo "Skipping cachix push, no token"
           else
-            cachix authtoken ${{ secrets.CACHIX_AUTH_GHAF_DEV }}
+            cachix authtoken ${{ secrets.CACHIX_AUTH_TOKEN }}
             echo "Running nix build, with cachix watch-exec"
             cachix watch-exec ghaf-dev -- \
               time nix build .#packages.${{ matrix.arch }}.${{ matrix.target }}