fix: use base64 encoding for kubeconfig secret

.woodpecker.yml

@@ -26,11 +26,11 @@ steps:
   deploy:
     image: bitnami/kubectl:latest
     environment:
-      KUBECONFIG_DATA:
+      KUBECONFIG_B64:
         from_secret: kubeconfig
     commands:
       - mkdir -p ~/.kube
-      - echo "$KUBECONFIG_DATA" > ~/.kube/config
+      - echo "$KUBECONFIG_B64" | base64 -d > ~/.kube/config
       - kubectl set image deployment/research-notes web=registry.threesix.ai/research-notes/web:${CI_COMMIT_SHA:0:8} -n projects
       - kubectl rollout status deployment/research-notes -n projects --timeout=120s
     when: