Use backend runners for API tests

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   php:
     name: PHP ${{ matrix.suite }} (required)
-    runs-on: [self-hosted, Linux, X64, default]
+    runs-on: [self-hosted, Linux, X64, pleno, backend]
     strategy:
       fail-fast: false
       matrix:
@@ -44,7 +44,7 @@ jobs:
 
   edge-agent:
     name: Edge Agent (required)
-    runs-on: [self-hosted, Linux, X64, default]
+    runs-on: [self-hosted, Linux, X64, pleno, backend]
 
     steps:
       - name: Checkout
@@ -91,7 +91,7 @@ jobs:
 
   edge-broker:
     name: Edge Broker (required)
-    runs-on: [self-hosted, Linux, X64, default]
+    runs-on: [self-hosted, Linux, X64, pleno, backend]
 
     steps:
       - name: Checkout
@@ -125,7 +125,7 @@ jobs:
 
   edge-gateway-backend:
     name: Edge Gateway Backend (required)
-    runs-on: [self-hosted, Linux, X64, default]
+    runs-on: [self-hosted, Linux, X64, pleno, backend]
     env:
       COMPOSE_FILE: docker-compose.yml:.github/docker-compose.ci.yml
       COMPOSE_PROJECT_NAME: edge-gateway-backend-${{ github.run_id }}-${{ github.run_attempt }}
@@ -281,7 +281,7 @@ jobs:
 
   release-manager-gate:
     name: Release Manager gate
-    runs-on: [self-hosted, Linux, X64, default]
+    runs-on: [self-hosted, Linux, X64, pleno, backend]
     needs: [php, edge-agent, edge-broker, edge-gateway-backend]
     if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}