Update testing.markdown - workaround GH Runner disk space issue (#1997)

* Update testing.markdown - workaround GH Runner disk space issue

* gh actions - link

Guide/testing.markdown

@@ -303,55 +303,4 @@ For more details on how to structure test suites see the [Hspec manual](http://h
 
 ## GitHub Actions
 
-The following GitHub Action workflow can be used to run the tests on CI:
-
-```yaml
-# .github/workflows/test.yml
-
-name: Test
-
-# Controls when the workflow will run
-on:
-  # Triggers the workflow on push or pull request events but only for the main branch
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
-jobs:
-  tests:
-    name: Run Tests
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v27
-      with:
-        nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/51bcdc4cdaac48535dabf0ad4642a66774c609ed.tar.gz
-
-    # Use the cachix cache for faster builds.
-    - name: Cachix Init
-      uses: cachix/cachix-action@v15
-      with:
-        name: digitallyinduced
-        skipPush: true
-
-    # Install direnv, which also `direnv allow`s the project.
-    - uses: HatsuneMiku3939/direnv-action@v1.0.7
-      with:
-        direnvVersion: 2.32.3
-
-    - name: Run project and tests
-      run: |
-          # Build generated files.
-          nix-shell --run "make build/Generated/Types.hs"
-
-          # Start the project in the background.
-          nix-shell --run "devenv up &"
-
-          # Execute the tests.
-          nix-shell --run "runghc $(make print-ghc-extensions) -i. -ibuild -iConfig Test/Main.hs"
-```
+A GitHub Action workflow can be used to run the tests on CI and do deployments. Consult the [IHP Boilerplate example](https://github.com/digitallyinduced/ihp-boilerplate/blob/master/.github/workflows/test.yml) for more details.