Sending attachments with the email sender

[andreleblanc11]

Currently the email sender isn't able to send images or byte files.

2025-01-15 17:32:38,752 [INFO] sarracenia.flowcb.log after_accept accepted: (lag: 3.83 )  exchange: xpublic subtopic: 20250115.ECONET-STATS.econet a file with baseUrl: http://econet.cmc.ec.gc.ca relPath: 20250115/ECONET-STATS/econet/Econet.jpg id: jigQqY7 size: 799141
2025-01-15 17:32:38,756 [ERROR] sarracenia.flowcb.send.email send Failed to read /apps/sarra/public_data/20250115/ECONET-STATS/econet/Econet.jpg, can't send
 to ['my-email']

We have a use case where we would want the email sender to be able to send images as attachments.
We could probably do this with a new option email_attachment. When True, send the file as an attachment.

I was able to send an email with the JPG mentionned up top with the following code

import os
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.image import MIMEImage
from email.mime.text import MIMEText
file = '/apps/sarra/public_data/20250115/ECONET-STATS/econet/Econet.jpg'
msg = MIMEMultipart()
msg['Subject'] = 'subject'
msg['From'] = "[email protected]"
msg['To'] = 'my-email'
text = MIMEText("test")
msg.attach(text)
with open(file, 'rb') as f:
    img_data = f.read()

image = MIMEImage(img_data, name=os.path.basename(file))
msg.attach(image)
s = smtplib.SMTP('mail-server')
s.sendmail(msg['From'], msg['To'], msg.as_string())