feat: include OS and arch in release binary name

Binary is now named node-lookup-linux-amd64 to match the target
platform of the golang:latest build container.

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

.woodpecker/release.yaml

@@ -11,7 +11,8 @@ steps:
     image: golang:latest
     commands:
       - VERSION=${CI_COMMIT_TAG}
-      - go build -ldflags="-s -w -X main.version=${VERSION}" -o node-lookup ./...
+      - BINARY=node-lookup-linux-amd64
+      - go build -ldflags="-s -w -X main.version=${VERSION}" -o ${BINARY} ./...
     depends_on: [test]
 
   - name: release
@@ -30,7 +31,7 @@ steps:
           NOTES=$(git log --merges --pretty=format:"- %s")
         fi
         tea releases edit "${CI_COMMIT_TAG}" --note "${NOTES}" --login gitea --repo "${CI_REPO}"
-        tea releases assets create "${CI_COMMIT_TAG}" node-lookup --login gitea --repo "${CI_REPO}"
+        tea releases assets create "${CI_COMMIT_TAG}" node-lookup-linux-amd64 --login gitea --repo "${CI_REPO}"
     backend_options:
       kubernetes:
         serviceAccountName: default