[ci] rename workflow & add cache

.github/workflows/build-image.yml

@@ -1,4 +1,4 @@
-name: ci
+name: Build on Push
 
 on:
   push:
@@ -37,6 +37,8 @@ jobs:
           push: ${{ github.ref == 'refs/heads/dev' }}
           tags: ${{ secrets.REGISTRY_URL }}/west/telegram-bot:latest,
               ${{ secrets.REGISTRY_URL }}/west/telegram-bot:${{ steps.commit_sha.outputs.sha_short }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       #-
       #  name: Redeploy container
       #  uses: fjogeleit/http-request-action@v1