fix: avoid gf cli install in docker build

Dockerfile

@@ -21,11 +21,16 @@ COPY server/ .
 RUN rm -rf resource/public/admin && mkdir -p resource/public/admin
 COPY --from=web-build /web/dist/ ./resource/public/admin/
 
-# main.go does `import _ "hotgo/internal/packed"`, a file normally generated by
-# `gf build` (see server/hack/config.yaml: packSrc/packDst) and gitignored —
-# generate it explicitly with the same gf CLI version pinned in go.mod.
-RUN go install github.com/gogf/gf/cmd/gf/v2@v2.10.0
-RUN gf pack resource internal/packed/packed.go
+# main.go imports internal/packed. Generate the packed resource file directly
+# through GoFrame's library API instead of installing the full gf CLI in CI.
+RUN printf '%s\n' \
+    'package main' \
+    'import "github.com/gogf/gf/v2/os/gres"' \
+    'func main() {' \
+    ' if err := gres.PackToGoFileWithOption("resource", "internal/packed/packed.go", "packed", gres.Option{}); err != nil { panic(err) }' \
+    '}' > /tmp/pack.go \
+    && go run /tmp/pack.go \
+    && rm /tmp/pack.go
 
 RUN CGO_ENABLED=0 go build -o /out/hotgo main.go