feat(action): break everything by splitting it into stages

.forgejo/workflows/demo.yaml

@@ -4,7 +4,7 @@ jobs:
   #   runs-on: docker
   #   steps:
   #     - run: echo All good!
-  dotnet:
+  checkout:
     runs-on: docker
     steps:
       - id: checkout
@@ -13,7 +13,9 @@ jobs:
           repository: "pascal_nulah/Nulah.PowerShell"
           ref: "feature/forgejo-runner-and-actions"
           github-server-url: "https://git.moar.ws/"
-      # idk just show me what the fuck exists
+  dotnet:
+    runs-on: dotnet
+    steps:
       - name: list directory contents
         run: ls ./.forgejo/dotnet-build -la
       - id: why_not_use_the_action_we_just_verified_exists_from_above