Reapply "Build post chat and attachment workflows"

This reverts commit 5bc4a551af.

docker-compose.yml

@@ -41,8 +41,8 @@ services:
       SMTP_HOST: ${SMTP_HOST}
       SMTP_PORT: ${SMTP_PORT}
       SMTP_USER: ${SMTP_USER}
-      SMTP_PASSWORD: ${SMTP_PASSWORD}
-      SMTP_FROM_EMAIL: ${SMTP_FROM_EMAIL}
+      SMTP_PASS: ${SMTP_PASS}
+      MAIL_FROM: ${MAIL_FROM}
       SMTP_FROM_NAME: ${SMTP_FROM_NAME}
       UPLOAD_MAX_SIZE_MB: ${UPLOAD_MAX_SIZE_MB}
       UPLOAD_ALLOWED_MIME_TYPES: ${UPLOAD_ALLOWED_MIME_TYPES}