Use configurable runner image in GitHub workflows (#1962)

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ concurrency:
 jobs:
   autofix:
     timeout-minutes: 10
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     steps:
       - name: Checkout Code 🛎
         uses: actions/checkout@v4

.github/workflows/close-conflicted-prs.yml

@@ -2,11 +2,11 @@ name: Close Old Conflicted PRs
 
 on:
   schedule:
-    - cron: "0 0 * * *"
+    - cron: '0 0 * * *'
 
 jobs:
   close_conflicted_prs:
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     permissions:
       pull-requests: write
     steps:

.github/workflows/close-stale-issues.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   stale:
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     permissions:
       issues: write
       contents: read

.github/workflows/deploy-to-prod-command.yml

@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   deploy-to-production:
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     name: Merge Staging to Production
     if: github.event.issue.pull_request && contains(github.event.issue.labels.*.name, 'production-deploy') && startsWith(github.event.comment.body, '/deploy') && github.event.comment.author_association == 'MEMBER'
     steps:

.github/workflows/lingo-dev.yml

@@ -22,7 +22,7 @@ concurrency:
 jobs:
   main:
     timeout-minutes: 15
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     steps:
       - name: Checkout Code 🛎
         uses: actions/checkout@v4

.github/workflows/sync-production.yml

@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   sync-branches:
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.RUNNER_IMAGE || 'ubuntu-latest' }}
     name: Syncing branches
 
     steps: