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Add docker workflow

Add docker workflow #1

name: Push containers to registries
on:
pull_request_target:
types: [closed]
paths:
- 'docker/Dockerfile'
- 'docker/entrypoint.sh'
jobs:
push_docker_containers:
runs-on: ubuntu-latest
strategy:
fail-fast: false
permissions:
contents: read
packages: write
steps:
- name: Checkout pull request branch
uses: actions/checkout@v4
with:
fetch-depth: 0
- name: Free Disk Space (Ubuntu)
uses: jlumbroso/free-disk-space@main
- name: Setup up docker buildx
uses: docker/setup-buildx-action@v2
- name: Log in to ghcr.io with docker
uses: docker/login-action@v3
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}
- name: Build and push docker containers
uses: docker/build-push-action@v6
with:
context: docker
push: true
tags: |
ghcr.io/${{ github.repository_owner }}/tmate-minimal:latest
outputs: type=image,compression=zstd,push=true