feat: upload EPUB & MOBI too

[davorpa]

CI/CD workflow should upload all generated artifacts.

Download webpage talks about book also exists in EPUB & MOBI formats.

So... add to promoted pipeline two more task in charge to upload both files, assuming same folder where PDF is hosted.

Improves semaphoreci/book-cicd-docker-kubernetes#10 (https://github.com/semaphoreci/book-cicd-docker-kubernetes/pull/10/commits/8e9d839e3833ec429870c22aa576c51859fbc145) adding semaphoreci/book-cicd-docker-kubernetes#6 build task

[davorpa]

Let me know if an env_var is needed to improve as:

    task:
      jobs:
        - name: Upload PDF
          commands:
            - artifact pull workflow CICD_with_Docker_Kubernetes_Semaphore.pdf
            - 'echo "put CICD_with_Docker_Kubernetes_Semaphore.pdf" | sshpass -p "$FTP_PASSWORD" sftp -P $FTP_PORT -o StrictHostKeyChecking=no $FTP_USER@$FTP_HOST:$FTP_FOLDER'
        - name: Upload EPUB
          commands:
            - artifact pull workflow CICD_with_Docker_Kubernetes_Semaphore.epub
            - 'echo "put CICD_with_Docker_Kubernetes_Semaphore.epub" | sshpass -p "$FTP_PASSWORD" sftp -P $FTP_PORT -o StrictHostKeyChecking=no $FTP_USER@$FTP_HOST:$FTP_FOLDER'
        - name: Upload MOBI
          commands:
            - artifact pull workflow CICD_with_Docker_Kubernetes_Semaphore.mobi
            - 'echo "put CICD_with_Docker_Kubernetes_Semaphore.mobi" | sshpass -p "$FTP_PASSWORD" sftp -P $FTP_PORT -o StrictHostKeyChecking=no $FTP_USER@$FTP_HOST:$FTP_FOLDER'
      env_vars:
        - name: FTP_FOLDER
          value: "/wp-content/uploads/2020/05/"
      secrets:
        - name: wordpress-sftp

:bulb: FTP_FOLDER env_var could be moved to sftp secret store and then obfuscate all external config completely.

[davorpa]

And... what about publish the HTML front-matter version too?