CI: install nodejs before checkout; recovery followup via ITILFollowup

golang:alpine lacks node (actions/checkout 127). GLPI 11 rejects the
legacy /followup input shape -> item-endpoint first, legacy fallback;
solve no longer skipped when followup fails.
Ticket: https://projects.knownelement.com/issues/824

Dockerfile

@@ -3,7 +3,8 @@ WORKDIR /src
 COPY go.mod ./
 COPY cmd/ ./cmd/
 RUN go build -ldflags="-s -w" -o /out/bridge ./cmd/bridge
-FROM scratch
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates && adduser -D -u 65532 app
 COPY --from=build /out/bridge /bridge
 USER 65532:65532
 EXPOSE 8080