🐞 Build images on self-hosted runner

I went to the trouble of building a GitHub Actions self-hosted runner,
so why not use it?

.github/workflows/docker-fedora-golang-bosh.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/docker-fedora-ruby-bind-utils.yml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/docker-sslip.io-dns-server.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build-and-push:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4