remove leftovers (#43)

.github/workflows/main.yml

@@ -1,38 +0,0 @@
-name: ci
-on:
-  push:
-    branches:
-      - 'develop'
-      - 'main'
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Get base image name
-        shell: bash
-        run: echo "##[set-output name=image;]$(echo gcr.io/up9-docker-hub/mizu/${GITHUB_REF#refs/heads/})"
-        id: base_image_step
-      - name: Docker meta
-        id: meta
-        uses: crazy-max/ghaction-docker-meta@v2
-        with:
-          images: ${{ steps.base_image_step.outputs.image }}
-          tags: |
-            type=sha
-            type=raw,${{ github.sha }}
-            type=raw,latest
-      - name: Login to DockerHub  
-        uses: docker/login-action@v1 
-        with:
-          registry: gcr.io
-          username: _json_key
-          password: ${{ secrets.GCR_JSON_KEY }}
-      - name: Build and push
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}