feat: auto-tune swap and Node.js memory based on VPS RAM

install.sh: detect RAM at runner install time and create swap only when
needed (<2GB → 2G swap, 2-4GB → 1G swap, >4GB → no swap).

workflow: detect RAM at build time and set NODE_OPTIONS accordingly
(<2GB → 768MB, 2-4GB → 1536MB, >4GB → 3072MB).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/docker-publish.yml

@@ -45,9 +45,17 @@ jobs:
           node-version: 20
 
       - name: Install Frontend Dependencies & Build
-        env:
-          NODE_OPTIONS: "--max-old-space-size=768"
         run: |
+          total_ram_mb=$(awk '/MemTotal/ { printf "%d", $2/1024 }' /proc/meminfo)
+          if [ "$total_ram_mb" -lt 2048 ]; then
+            node_mem=768
+          elif [ "$total_ram_mb" -lt 4096 ]; then
+            node_mem=1536
+          else
+            node_mem=3072
+          fi
+          echo "RAM: ${total_ram_mb}MB — setting Node.js max to ${node_mem}MB"
+          export NODE_OPTIONS="--max-old-space-size=${node_mem}"
           cd frontend
           yarn install --frozen-lockfile
           yarn locale-compile

install.sh

@@ -778,18 +778,31 @@ do_forgejo_runner_install() {
 
     mkdir -p "$FORGEJO_RUNNER_DIR"
 
-    # Ensure swap exists for low-RAM VPS (Docker image builds need ~2GB memory)
+    # Auto-configure swap based on available RAM
+    local total_ram_mb
+    total_ram_mb=$(awk '/MemTotal/ { printf "%d", $2/1024 }' /proc/meminfo)
+    local swap_size=""
+    if [ "$total_ram_mb" -lt 2048 ]; then
+        swap_size="2G"
+    elif [ "$total_ram_mb" -lt 4096 ]; then
+        swap_size="1G"
+    fi
+
+    if [ -n "$swap_size" ]; then
         if [ ! -f /swapfile ]; then
-        log_step "Creating 2GB swapfile for build memory..."
+            log_step "RAM: ${total_ram_mb}MB detected — creating ${swap_size} swapfile..."
-        fallocate -l 2G /swapfile
+            fallocate -l "$swap_size" /swapfile
             chmod 600 /swapfile
             mkswap /swapfile > /dev/null
             swapon /swapfile
             echo '/swapfile none swap sw 0 0' >> /etc/fstab
-        log_ok "Swapfile created and enabled (persistent across reboots)."
+            log_ok "Swapfile ${swap_size} created and enabled (persistent across reboots)."
         else
             log_ok "Swapfile already exists, skipping."
         fi
+    else
+        log_ok "RAM: ${total_ram_mb}MB — sufficient, no swap needed."
+    fi
 
     # gitea/act_runner auto-registers on first start via env vars, then starts daemon
     log_step "Starting Forgejo Runner (auto-register on first boot)..."