build and push image to docker hub in a single action

Signed-off-by: Vincent Cui <dustise@live.com>

.github/workflows/build-to-dockerhub.yml

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+name: Build Images and push them to Dockerhub
+on:
+  release:
+    types:
+      - published
+jobs:
+  release-image:
+    name: Release images
+    strategy:
+      matrix:
+        target:
+          - karmada-aggregated-apiserver
+          - karmada-controller-manager 
+          - karmada-scheduler
+          - karmada-webhook
+          - karmada-agent
+          - karmada-scheduler-estimator
+          - karmada-interpreter-webhook-example
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x        
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USER_NAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        env: 
+          VERSION: ${{ github.ref_name }}
+        run: make mp-image-${{ matrix.target }}

cluster/images/general/Dockerfile

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+FROM golang:1.17 as builder
+COPY karmada /code/karmada
+WORKDIR /code/karmada
+RUN make _TARGET_
+
+FROM alpine:3.7
+RUN apk add -u --no-cache ca-certificates
+COPY --from=builder "/code/karmada/_TARGET_" /bin/
+CMD ["/bin/_TARGET_"]
+