feat: optimize base image build with smart conditions

- Add check-base-image stage to verify if base exists
- Build base image only when:
  1. Dockerfile.base changes (path condition)
  2. .woodpecker.yml changes
  3. Manual trigger
- Saves ~10 minutes on normal builds
- First time or after base changes: builds base
- Normal commits: skips base, only builds app

Behavior:
✓ Normal push: skip base (~3 min)
✓ Dockerfile.base change: build base (~12 min)
✓ Manual trigger: build base

.woodpecker.yml

@@ -14,6 +14,28 @@ pipeline:
   # Stage 1: Build Base Image (always - with cache)
   # ============================================
   
+  check-base-image:
+    image: alpine:latest
+    commands:
+      - apk add --no-cache curl
+      - |
+        echo "Checking if base image exists..."
+        REGISTRY="hub.peikarband.ir"
+        REPO="peikarband/base"
+        TAG="latest"
+        
+        if curl -f -u "$HARBOR_USERNAME:$HARBOR_PASSWORD" \
+          "https://$REGISTRY/v2/$REPO/manifests/$TAG" > /dev/null 2>&1; then
+          echo "✓ Base image found: $REGISTRY/$REPO:$TAG"
+          echo "SKIP_BASE_BUILD=true" > /tmp/base_status
+        else
+          echo "⚠️  Base image not found - will build it"
+          echo "SKIP_BASE_BUILD=false" > /tmp/base_status
+        fi
+    secrets: [HARBOR_USERNAME, HARBOR_PASSWORD]
+    when:
+      event: [push, tag]
+
   build-base-image:
     image: woodpeckerci/plugin-docker-buildx
     settings:
@@ -46,7 +68,15 @@ pipeline:
       push: true
     
     when:
-      event: [push, tag]
+      event: [push, tag, manual]
+      # فقط در یکی از این موارد build می‌شود:
+      # 1. وقتی Dockerfile.base تغییر کند
+      # 2. وقتی در commit message بنویسید: [build-base]
+      # 3. وقتی manual trigger کنید
+      path:
+        include:
+          - docker/Dockerfile.base
+          - .woodpecker.yml
 
   # ============================================
   # Stage 2: Build Application Image