action.yml

name: "Container Registry Login"
description: "Reusable action for logging in to container registries using workflow inputs"
inputs:
  registry_provider:
    required: false
  gcp_service_account_key:
    required: false
  registry_name:
    required: false
  registry_url:
    required: false
  registry_username:
    required: false
  registry_password:
    required: false
  github_token:
    required: false
runs:
  using: "composite"
  steps:
    - run: |
        case "${{ inputs.registry_provider }}" in
          "gcp")
            echo "Using Google Container Registry"
            echo "${{ inputs.gcp_service_account_key }}" | base64 --decode > $HOME/gcloud-key.json
            gcloud auth activate-service-account --key-file=$HOME/gcloud-key.json
            gcloud auth configure-docker ${{ inputs.registry_name }}
            REGISTRY_URL=$(echo "${{ inputs.registry_url }}" | tr '[:upper:]' '[:lower:]')
            ;;
          "azure" | "dockerhub")
            echo "Logging in to Container Registry"
            echo "${{ inputs.registry_password }}" | docker login ${{ inputs.registry_name }} \
              --username ${{ inputs.registry_username }} --password-stdin
            REGISTRY_URL=$(echo "${{ inputs.registry_url }}" | tr '[:upper:]' '[:lower:]')
            ;;
          *)
            echo "Using GitHub Container Registry (GHCR)"
            REPO_NAME_LOWERCASE=$(echo "${GITHUB_REPOSITORY}" | tr '[:upper:]' '[:lower:]')
            echo "${{ inputs.github_token }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
            REGISTRY_URL="ghcr.io/$REPO_NAME_LOWERCASE"
            ;;
        esac
        echo "REGISTRY_URL=${REGISTRY_URL}" >> $GITHUB_ENV
      shell: bash