Add publish-krte-images.yaml (#5179)

* Add publish-krte-images.yaml
Signed-off-by: Nquicksilver <zhifeng.zhang@zilliz.com>

* Update publish-krte-images.yaml
Signed-off-by: Nquicksilver <zhifeng.zhang@zilliz.com>

.github/workflows/publish-krte-images.yaml

+name: Publish KRTE Images
+# TODO: do not trigger action for some document file update
+
+# This workflow is triggered on pushes or pull request to the repository.
+on:
+  push:
+    # file paths to consider in the event. Optional; defaults to all.
+    paths:
+      - 'build/docker/krte/**'
+      - '.github/workflows/publish-krte-images.yaml'
+  pull_request:
+    # file paths to consider in the event. Optional; defaults to all.
+    paths:
+      - 'build/docker/krte/**'
+      - '.github/workflows/publish-krte-images.yaml'
+
+jobs:
+  publish-krte-images:
+    name: KRTE
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Check Dockerfile
+        uses: reviewdog/action-hadolint@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: github-pr-check # Default is github-pr-check
+          hadolint_ignore: DL3008 SC1091 DL3013 DL3003
+      - name: Get version from system time after release step
+        id: extracter
+        run: |
+          echo "::set-output name=version::$(date +%Y%m%d)"
+          echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+      - name: Docker Build
+        shell: bash
+        working-directory: build/docker/krte
+        run: |
+          export TAG=${{ steps.extracter.outputs.version }}-${{ steps.extracter.outputs.sha_short }}
+          docker build --build-arg IMAGE_ARG="milvusdb/krte:$TAG" --build-arg GO_VERSION=1.15.8 -t "milvusdb/krte:$TAG" .
+      - name: Docker Push
+        if: success() && github.event_name == 'push' && github.repository == 'milvus-io/milvus'
+        continue-on-error: true
+        shell: bash
+        run: |
+          docker login -u ${{ secrets.DOCKERHUB_USER }} \
+                       -p ${{ secrets.DOCKERHUB_TOKEN }}
+          export TAG=${{ steps.extracter.outputs.version }}-${{ steps.extracter.outputs.sha_short }}
+          docker push "milvusdb/krte:$TAG"
+          echo "Push krte image Succeeded"