speedup docker builds

.github/workflows/docker-builder.yml

@@ -0,0 +1,28 @@
+name: Build go-builder images
+
+on:
+  workflow_dispatch:
+  schedule:
+    -cron: '00 21 * * SUN'
+
+jobs:
+  go-builder:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: SetUp Buildx
+      uses: docker/setup-buildx-action@v1
+    - name: Login to Dockerhub
+      uses: docker/login-action@v1
+      with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      name: Build and push to docker hub
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        load: true
+        platform: linux/amd64
+        file: ./docker/Dockerfile-go-builder
+        tags: gravitl/go-builder:latest