Add composer-installer alternative

[szepeviktor]

https://github.com/ergebnis/.github/blob/main/actions/composer/install/run.sh

name: "Shared Install Dependencies"

inputs:
  dependencies:
    type: "string"
    default: "highest"
    required: true

runs:
  using: "composite"

  steps:
    - name: "Install lowest dependencies"
      if: ${{ inputs.dependencies == 'lowest' }}
      shell: "bash"
      run: "composer update --prefer-lowest --no-interaction --no-progress"

    - name: "Install highest dependencies"
      if: ${{ inputs.dependencies == 'highest' }}
      shell: "bash"
      run: "composer update --no-interaction --no-progress"

    - name: "Install locked dependencies"
      if: ${{ inputs.dependencies == 'locked' }}
      shell: "bash"
      run: |
        test -f composer.lock
        composer install --no-interaction --no-progress

    - name: "Install development dependencies"
      if: ${{ inputs.dependencies == 'development' }}
      shell: "bash"
      run: |
          composer config --no-interaction -- minimum-stability dev
          composer update --no-interaction --no-progress