ci: add missing mail script

Author: pmoscode

pipeline/mail_data.tpl.json

@@ -0,0 +1,21 @@
+{
+  "Messages":[
+    {
+      "From": {
+        "Email": "$MAILJET_FROM_MAIL"
+      },
+      "To": [
+        {
+          "Email": "$MAILJET_TO_MAIL"
+        }
+      ],
+      "TemplateID": 5363003,
+      "TemplateLanguage": true,
+      "Subject": "$MAILJET_SUBJECT",
+      "Variables": {
+        "project_name": "$GITHUB_REPOSITORY",
+        "project_url": "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID"
+      }
+    }
+  ]
+}

pipeline/send_mail.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -e
+
+cat pipeline/mail_data.tpl.json | envsubst > mail_data.json
+
+curl -s \
+  -X POST \
+  --user "$MAILJET_KEY:$MAILJET_SECRET" \
+  https://api.mailjet.com/v3.1/send \
+  -H 'Content-Type: application/json' \
+  -d '@./mail_data.json'
+
+rm mail_data.json