Github workflow: requested access to the resource is denied - docker

Question

I am trying to use GitHub workflow to build an ASP.NET 6 project using Dockerfile then push the image to a private Azure Registry using docker.
Here is my .yml file
name: Docker Image CI
on:
push:
branches: [ "main" ]
pull_request:
branches: [ "main" ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout#v3
- name: Login To Azure Container Registr
uses: Azure/docker-login#v1
with:
login-server: ${{ secrets.ACR_HOST }}
username: ${{ secrets.ACR_USERNAME }}
password: ${{ secrets.ACR_PASSWWORD }}
- name: Build And Push Docker Images
uses: docker/build-push-action#v3.1.1
with:
push: true
file: ./Dockerfile
tags: companyname/projectname:${{ github.run_number }}
In the above, the Dockerfile is located in the root of my project's code.
However, the the build runs I get the following error
Error: buildx failed with: error: denied: requested access to the resource is denied
In the Secrets > Action section in my repository settings, I added ACR_HOST, ACR_USERNAME and ACR_PASSWORD secrets.
When viewing the logs, this issue seems to happen after this line in the logs
pushing companyname/projectname:2 with docker:
How can I solve this issue?
UPDATED
I changed the .yml script to the following
name: Docker Image CI
on:
push:
branches: [ "main" ]
pull_request:
branches: [ "main" ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout#v3
- name: Login To Azure Container Registr
uses: Azure/docker-login#v1
with:
login-server: mycontainer.azurecr.io
username: "The admin username"
password: "The admin password"
- run: cat ${{ env.DOCKER_CONFIG }}/config.json
- name: Build And Push Docker Images
uses: docker/build-push-action#v3.1.1
with:
push: true
file: ./Dockerfile
tags: companyname/projectname:${{ github.run_number }}
The added step (i.e., cat ${{ env.DOCKER_CONFIG }}/config.json) displayed a json string that look like this
{"auths":{"mycontainer.azurecr.io":{"auth":"BASE64 string with the admin username:password as expected"}}}
The base64 string was formatted like this username:password
I am assuming that the step Azure/docker-login#v1 has no issue and stages the token for docker/build-push-action#v3.1.1 correctly.
If I set the push flag to false in the docker/build-push-action#v3.1.1 step, the workflow runs with no issue. So from what I can tell, the issue is when the step docker/build-push-action#v3.1.1 tries to push the created image to the Azure registry.
I use my local machine to login using the same credentials and all worked with no issue docker login mycontainer.azurecr.io
Additionally, the login request from my local machine is logged into Azure portal. However, I do not see the request when I run the workflow.
I think that main issue is that the step docker/build-push-action#v3.1.1 does not attempt to login before it pushes the image.

Answer 1

I followed the instructions here and it worked.