Add build using buildah

[gbraad]

Describe build using buildah:

    - name: Build image
      id: build-image
      uses: redhat-actions/buildah-build@v2
      with:
        image: ${{ env.IMAGE_NAME }}
        tags: ${{ env.IMAGE_TAGS }}
        oci: true
        build-args: |
          BASE_IMAGE=quay.io/fedora/fedora-bootc
          BASE_VERSION=41
        containerfiles: |
          ./Containerfile
    - name: Push to registry
      id: push-to-registry
      uses: redhat-actions/push-to-registry@v2
      with:
        image: ${{ steps.build-image.outputs.image }}
        tags: ${{ steps.build-image.outputs.tags }}
        registry: ${{ env.IMAGE_REGISTRY }}
        username: ${{ env.REGISTRY_USER }}
        password: ${{ env.REGISTRY_PASSWORD }}
        extra-args: |
          --disable-content-trust
    - name: Print image url
      run: echo "Image pushed to ${{ steps.push-to-registry.outputs.registry-paths }}"

https://github.com/gbraad-fedora/fedora-bootc-workstation/blob/f1c87a33820ceacec6a9946ce59e581f6673fe43/.github/workflows/container-build.yml#L28-L52