Replace gitea-release plugin with curl-based release upload

Uses basic auth (droneci user) and Gitea API directly to create
the release and upload the binary asset.
Fix the golangci-lint issues

.woodpecker/release.yaml

@@ -15,22 +15,20 @@ steps:
     depends_on: [test]
 
   - name: release
-    image: git.unkin.net/unkin/almalinux9-base:20260325
+    image: alpine/curl
     environment:
-      RELEASER_TOKEN:
-        from_secret: RELEASER_TOKEN
+      DRONECI_PASSWORD:
+        from_secret: DRONECI_PASSWORD
     commands:
       - |
-        curl --output /usr/local/bin/tea https://artifactapi.k8s.syd1.au.unkin.net/api/v1/remote/gitea-dl/tea/0.12.0/tea-0.12.0-linux-amd64 && chmod +x /usr/local/bin/tea
-        tea logins add --name gitea --url https://git.unkin.net --token "$${RELEASER_TOKEN}" --no-version-check
-        PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
-        if [ -n "$PREV_TAG" ]; then
-          NOTES=$(git log "${PREV_TAG}..${CI_COMMIT_TAG}" --merges --pretty=format:"- %s")
-        else
-          NOTES=$(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 "${CI_REPO}"
+        RELEASE_ID=$(curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases" \
+          -u "droneci:$DRONECI_PASSWORD" \
+          -H "Content-Type: application/json" \
+          -d "{\"tag_name\":\"${CI_COMMIT_TAG}\",\"name\":\"${CI_COMMIT_TAG}\"}" \
+          | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+        curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases/${RELEASE_ID}/assets" \
+          -u "droneci:$DRONECI_PASSWORD" \
+          -F "attachment=@node-lookup"
     backend_options:
       kubernetes:
         serviceAccountName: default