fix: use linux,x86_64,docker runner (avoids container DNS isolation)

.gitea/workflows/syntax-check.yml

@@ -19,36 +19,24 @@ on:
 
 jobs:
   syntax-check:
-    runs-on: ubuntu-latest
+    runs-on: linux,x86_64,docker
     steps:
       - name: Checkout code
         run: |
           git clone --depth 1 "$(echo "${{ gitea.server_url }}" | sed "s|://|://oauth2:${{ gitea.token }}@|")/${{ gitea.repository }}.git" .
           git checkout -q ${{ github.sha }}
-          echo "✓ Checkout complete"
-          ls -la slackecho
 
       - name: Install shellcheck
-        run: |
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
-          echo "Installing shellcheck..."
-          sudo apt-get update && sudo apt-get install -y shellcheck
-          echo "✓ shellcheck installed"
 
       - name: Run bash syntax check
-        run: |
+        run: bash -n slackecho
-          echo "Running bash syntax check..."
-          bash -n slackecho
-          echo "✓ Syntax check passed"
 
       - name: Run shellcheck analysis
-        run: |
+        run: shellcheck slackecho
-          echo "Running shellcheck analysis..."
-          shellcheck slackecho
-          echo "✓ Shellcheck passed"
 
       - name: Verify script is executable
         run: |
-          echo "Checking executable permission..."
           if [ -x slackecho ]; then
             echo "✓ slackecho is executable"
           else