Replace TLS by STARTTLS for mails in OMF [skip ci]

pica-oh-my-form/Dockerfile

@@ -33,7 +33,9 @@ ENV ADMIN_EMAIL=picasoft@assos.utc.fr \
     MAILER_FROM=form@picasoft.net \
     MAILER_SMTP_HOST=mail.picasoft.net \
     MAILER_SMTP_PORT=587 \
-    MAILER_SMTP_SECURE=TRUE \
+    # This does not mean that it will connect in cleartext to the mail server!
+    # It will use STARTTLS if enabled, as on our mailserver (https://nodemailer.com/smtp/#tls-options)
+    MAILER_SMTP_SECURE=FALSE \
     NODE_ENV=production \
     PORT=5000 \
     ROOT=/opt/app \