Simplify runs-on property in deploy workflow

Updated the 'runs-on' property to use 'self-hosted' directly for both jobs.

.github/workflows/deploy.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   detect-changes:
     name: Detect changed services
-    runs-on: ${{ fromJson(format('["self-hosted", "{0}"]', github.ref_name)) }}
+    runs-on:self-hosted
     outputs:
       matrix: ${{ steps.filter.outputs.matrix }}
     steps:
@@ -91,7 +91,7 @@ jobs:
     name: Deploy ${{ matrix.service }}
     needs: detect-changes
     if: ${{ needs.detect-changes.outputs.matrix != '[]' }}
-    runs-on: ${{ fromJson(format('["self-hosted", "{0}"]', github.ref_name)) }}
+    runs-on: self-hosted
     strategy:
       fail-fast: false
       matrix: