Update Dockerfile and build script to include HOST_UID and HOST_GID arguments for improved user permissions

Dockerfile

@@ -1,5 +1,7 @@
 ARG UBUNTU_VERSION=24.04
 FROM ubuntu:${UBUNTU_VERSION}
+ARG HOST_UID
+ARG HOST_GID
 
 RUN apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
@@ -10,7 +12,8 @@ RUN apt-get update \
 
 WORKDIR /build
 COPY . src/
-RUN cd src && dpkg-buildpackage -us -uc -b \
- && mkdir /out \
+RUN cd src && dpkg-buildpackage -us -uc -b
+
+RUN mkdir /out \
  && find /build -maxdepth 1 \( -name '*.deb' -o -name '*.buildinfo' -o -name '*.changes' \) \
-        -exec mv {} /out/ \;
+        -exec install -o "$HOST_UID" -g "$HOST_GID" -m 0644 {} /out/ \;