Simplify GitHub action for dependabot PRs

.github/workflows/build.yaml

@@ -14,30 +14,9 @@ jobs:
       id: extracttag
       run: |
         echo "tag=$(awk -F: '/^FROM/ { print $2 }' Dockerfile)" >> $GITHUB_OUTPUT
-  build:
-    runs-on: ubuntu-latest
-    needs: imagetag
-    steps:
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v3
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
-    - name: Login to GitHub Container Registry
-      uses: docker/login-action@v3
-      with:
-        registry: ghcr.io
-        username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
-    - name: Build and push
-      id: docker_build
-      uses: docker/build-push-action@v5
-      with:
-        platforms: linux/amd64,linux/arm64
-        tags: ghcr.io/amazeeio/opensearch:pr${{ github.event.pull_request.number }}-${{ needs.imagetag.outputs.version }}
   build-push:
     runs-on: ubuntu-latest
     needs: imagetag
-    if: ${{ github.actor != 'dependabot[bot]' }}
     steps:
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3
@@ -54,5 +33,5 @@ jobs:
       uses: docker/build-push-action@v5
       with:
         platforms: linux/amd64,linux/arm64
-        push: true
+        push: ${{ github.actor != 'dependabot[bot]' }} # don't push dependabot PRs
         tags: ghcr.io/amazeeio/opensearch:pr${{ github.event.pull_request.number }}-${{ needs.imagetag.outputs.version }}