Handle existing runner swap

Author: AnastaZIuk

.github/workflows/devsh-foss-image.yml

@@ -102,10 +102,16 @@ jobs:
         if: steps.cache-bundle.outputs.cache-hit != 'true'
         run: |
           set -euo pipefail
-          sudo fallocate -l 8G /swapfile || sudo dd if=/dev/zero of=/swapfile bs=1M count=8192
-          sudo chmod 600 /swapfile
-          sudo mkswap /swapfile
-          sudo swapon /swapfile
+          if swapon --show=NAME --noheadings | grep -qx '/swapfile'; then
+            echo "/swapfile is already active"
+            free -h
+            exit 0
+          fi
+          swapfile="/mnt/devsh-swapfile-${GITHUB_RUN_ID}"
+          sudo fallocate -l 8G "${swapfile}" || sudo dd if=/dev/zero of="${swapfile}" bs=1M count=8192
+          sudo chmod 600 "${swapfile}"
+          sudo mkswap "${swapfile}"
+          sudo swapon "${swapfile}"
           free -h
 
       - name: Cache Vite