remove build workflows

Merged changes from source-branch as a single commit

.github/workflows/docker-image.yml

@@ -1,36 +0,0 @@
-name: Docker Image CI
-
-on:
-  push:
-    branches: [ "upgrade/separate-images/ci-cd-testing" ]
-  pull_request:
-    branches: [ "upgrade/separate-images/ci-cd-testing" ]
-
-jobs:
-
-  build:
-
-    runs-on: self-hosted
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v4
-        with:
-          context: .
-          push: true
-          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/blockbook:1.0.0
-
-      - name: Log out from Docker Hub
-        run: docker logout