ci: add mail pipeline step

.woodpecker.yml

@@ -176,3 +176,12 @@ pipeline:
       - earthly --push --secret NPM_TOKEN +publish-js-all
     when:
       branch: [main]
+
+  mail:
+    image: deblan/woodpecker-email
+    secrets: [MAIL_FROM, MAIL_HOST, MAIL_USERNAME, MAIL_PASSWORD]
+    settings:
+      from.address: $MAIL_FROM
+      host: $MAIL_HOST
+      username: $MAIL_USERNAME
+      password: $MAIL_PASSWORD