feat: build image with default user and group 1000

Dockerfile

@@ -3,6 +3,8 @@ FROM golang:1.23-bookworm AS build
 RUN apt-get update \
     && apt-get install -y protobuf-compiler
 
+RUN groupadd --gid 1000 app && useradd -u 1000 -g app app
+
 WORKDIR /go/src/github.com/softonic/homing-pigeon
 
 COPY . .
@@ -12,6 +14,10 @@ RUN make build &&\
 
 FROM scratch
 
-COPY --from=build /go/src/github.com/softonic/homing-pigeon/bin/homing-pigeon /
+COPY --from=build /etc/passwd /etc/passwd
+COPY --from=build /etc/group /etc/group
+COPY --chown=app:app --from=build /go/src/github.com/softonic/homing-pigeon/bin/homing-pigeon /
+
+USER app
 
 ENTRYPOINT ["/homing-pigeon", "-logtostderr"]