fix: add failure:ignore to docs build steps

When docs infrastructure doesn't exist, the docs build steps should
gracefully skip without failing the entire pipeline.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/adapter/templates/templates/skeleton/.woodpecker.yml.tmpl

@@ -123,9 +123,11 @@ steps:
       event: push
 
   # Build and push docs-nginx image (skipped if no docs build output)
+  # failure: ignore allows pipeline to continue if docs weren't built
   build-docs-image:
     depends_on: [build-docs]
     image: woodpeckerci/plugin-kaniko
+    failure: ignore
     settings:
       registry: registry.threesix.ai
       repo: {{PROJECT_NAME}}-docs
@@ -144,6 +146,7 @@ steps:
   deploy-docs:
     image: bitnami/kubectl:latest
     depends_on: [build-docs-image]
+    failure: ignore
     commands:
       - |
         # Check if docs image exists by trying to describe the deployment