ci: try running on self-hosted

Author: thomasjm

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   stack:
     name: stack / ghc ${{ matrix.ghc }}
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     strategy:
       fail-fast: false
       matrix:
@@ -46,7 +46,7 @@ jobs:
         stack test --system-ghc --test-arguments --print
 
   no-gmp:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     strategy:
       fail-fast: false
     steps:
@@ -65,7 +65,7 @@ jobs:
 
   nix:
     name: Nix
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     strategy:
       fail-fast: false