fix: CI: compile releases with nightly and remove quotes from smtp URL

nightly required because of mockall

.woodpecker.yml

@@ -5,7 +5,7 @@ steps:
       event: [push, pull_request, tag, deployment]
     environment:
       - DATABASE_URL=postgres://postgres:password@database:5432/postgres
-      - VANIKAM_email_URL="smtp://admin:password@email:10025"
+      - VANIKAM_email_URL=smtp://admin:password@email:10025
       - MAILDEV_URL=http://email:1080
       - VANIKAM_email_FROM="Vanikam Info <info@vanikam.app>"
       - VANIKAM_email_REPLY_TO="Vanikam Support <support@vanikam.app>"
@@ -20,13 +20,6 @@ steps:
       - make db.migrate
       - make lint
       - make test
-
-  build_binary:
-    image: rust
-    when:
-      event: [push, pull_request, tag, deployment]
-    commands:
-      - rustup override set stable
       - make release
 
   build_docker_img: