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

@@ -15,33 +15,19 @@ 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:
       - |
-        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
-        BODY=$(printf '%s' "$NOTES" | sed 's/"/\\"/g; s/$/\\n/' | tr -d '\n')
-        GET_RESPONSE=$(curl -s "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases/tags/${CI_COMMIT_TAG}")
-        echo "GET response: ${GET_RESPONSE}"
-        RELEASE_ID=$(printf '%s' "${GET_RESPONSE}" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
-        if [ -z "$RELEASE_ID" ]; then
-          echo "ERROR: failed to find release for tag ${CI_COMMIT_TAG}" >&2
-          exit 1
-        fi
-        echo "Release ID: ${RELEASE_ID}"
-        curl -s -X PATCH "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases/${RELEASE_ID}" \
-          -H "Authorization: token ${RELEASER_TOKEN}" \
+        RELEASE_ID=$(curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases" \
+          -u "droneci:$DRONECI_PASSWORD" \
           -H "Content-Type: application/json" \
-          -d "{\"body\":\"${BODY}\"}"
-        curl -s -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases/${RELEASE_ID}/assets" \
-          -H "Authorization: token ${RELEASER_TOKEN}" \
+          -d "{\"tag_name\":\"${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: