Revert "Update workers to self hosted" (#638)

.github/workflows/build-in-docker.yml

@@ -15,7 +15,7 @@ env:
 
 jobs:
   checkout:
-    runs-on: [self-hosted, xahaud-build]
+    runs-on: [self-hosted, vanity]
     outputs:
       checkout_path: ${{ steps.vars.outputs.checkout_path }}
     steps:

.github/workflows/levelization.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   check:
-    runs-on: [self-hosted, generic]
+    runs-on: ubuntu-latest
     env:
       CLANG_VERSION: 10
     steps:

.github/workflows/verify-generated-headers.yml

@@ -18,7 +18,7 @@ jobs:
             generator: bash ./hook/generate_sfcodes.sh
           - target: hook/tts.h
             generator: ./hook/generate_tts.sh
-    runs-on: [self-hosted, generic]
+    runs-on: ubuntu-latest
     name: ${{ matrix.target }}
     steps:
       - name: Checkout repository

.github/workflows/xahau-ga-nix.yml

@@ -14,7 +14,7 @@ concurrency:
 
 jobs:
   matrix-setup:
-    runs-on: [self-hosted, generic]
+    runs-on: ubuntu-latest
     container: python:3-slim
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}