I was not able to do the docker push using a proxy.

[demissiea]

I'm using a self-hosted GitHub Actions runner setup with Actions Runner Controller (ARC) on Azure AKS, along with a small VM serving as a proxy for the AKS. I'm experiencing issues when trying to push Docker images to my self-hosted registry using docker/build-push-action@v6 in GitHub Actions. The push works flawlessly when I build and push the Docker images using regular Docker commands on the workflow, but it fails when using this GitHub Action. What could be causing this discrepancy, and how can I resolve it?

Here is a sample code I tried:

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  build-and-push:
    runs-on: selfhosted-ubuntu-runners

    steps:
          
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      
      
      - name: Login to selfhosted-registry.com
        uses: docker/login-action@v3
        with:
          registry: selfhosted-registry.com
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASS }}  
          

      - name: Build and Push Docker Image
        id: push-tag
        uses: docker/build-push-action@v6
        with:
          context: .  
          push: true
          tags: "selfhosted-registry.com/testrepo:01"
          build-args: |
              http_proxy=${{ secrets.http_proxy }}
              https_proxy=${{ secrets.https_proxy }}```