ci: drop main branch

.woodpecker/build.yml

@@ -1,19 +1,4 @@
 steps:
-  - name: build latest
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      repo: registry.odit.services/lfk/mailer
-      tags:
-        - latest
-      registry: registry.odit.services
-      platforms: linux/amd64,linux/arm64
-      cache_from: registry.odit.services/lfk/mailer:dev
-      username:
-        from_secret: odit-registry-builder-username
-      password:
-        from_secret: odit-registry-builder-password
-    when:
-      branch: main
   - name: build dev
     image: woodpeckerci/plugin-docker-buildx
     settings: