ci: use self-hosted runners to build

.github/workflows/release-to-candidate.yaml

@@ -1,9 +1,9 @@
 name: Release
 
 on:
-  # Run the workflow each time new commits are pushed to the candidate branch. 
+  # Run the workflow each time new commits are pushed to the candidate branch.
   push:
-    branches: [ "candidate" ]
+    branches: ["candidate"]
   workflow_dispatch:
 
 concurrency:
@@ -29,7 +29,7 @@ jobs:
   release:
     name: 🚢 Release to latest/candidate
     needs: get-architectures
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     environment: "Candidate Branch"
     strategy:
       matrix:
@@ -42,7 +42,7 @@ jobs:
           launchpad-token: ${{ secrets.LP_BUILD_SECRET }}
           repo-token: ${{ secrets.SNAPCRAFTERS_BOT_COMMIT }}
           store-token: ${{ secrets.SNAP_STORE_CANDIDATE }}
-  
+
   call-for-testing:
     name: 📣 Create call for testing
     needs: [release, get-architectures]