intelligent check for new tags before building

.drone.yml

@@ -4,14 +4,23 @@ type: docker
 name: default
 
 steps:
-  # Step 1: Install dependencies & build Node.js app
-  - name: install-and-build
-    image: node:20-alpine
+  # Step 1: Check if Docker image for current version already exists
+  - name: check-version
+    image: docker:24
+    environment:
+      DOCKER_HOST: unix:///var/run/docker.sock
     commands:
-      - echo "Installing dependencies..."
-      - npm ci
-      - echo "Building app..."
-      - npm run build
+      - apk add --no-cache git
+      - git fetch --tags
+      - LATEST_TAG=$(git describe --tags --abbrev=0)
+      - echo "Latest Git tag: $LATEST_TAG"
+      - |
+        if docker image inspect apps/homepage:$NEW_VERSION > /dev/null 2>&1; then
+          echo "Docker image apps/homepage:$NEW_VERSION already exists — skipping build"
+          exit 0
+        else
+          echo "Docker image apps/homepage:$NEW_VERSION not found — building..."
+        fi
 
   # Step 2: Build Docker image with dynamic Git tag
   - name: build-image
@@ -50,4 +59,5 @@ steps:
 # Trigger pipeline on Git tags
 trigger:
   event:
+    - push
     - tag