fix: correct newlin issue

Author: JacobCoffee

dockerfiles/Dockerfile.jammy

@@ -52,7 +52,7 @@ RUN wget --quiet -O /etc/apt/keyrings/salt-archive-keyring-2024.pgp https://pack
 RUN echo "deb [signed-by=/etc/apt/keyrings/salt-archive-keyring-2024.pgp arch=$(dpkg --print-architecture)] https://packages.broadcom.com/artifactory/saltproject-deb/ stable main" > /etc/apt/sources.list.d/salt.list
 
 # Pin to Salt 3006 LTS
-RUN echo -e "Package: salt-*\nPin: version 3006.*\nPin-Priority: 1001" > /etc/apt/preferences.d/salt-pin-1001
+RUN printf "Package: salt-*\nPin: version 3006.*\nPin-Priority: 1001\n" > /etc/apt/preferences.d/salt-pin-1001
 
 RUN apt-get update -y && apt-get install -y --no-install-recommends salt-minion
 

dockerfiles/Dockerfile.noble

@@ -52,7 +52,7 @@ RUN wget --quiet -O /etc/apt/keyrings/salt-archive-keyring-2024.pgp https://pack
 RUN echo "deb [signed-by=/etc/apt/keyrings/salt-archive-keyring-2024.pgp arch=$(dpkg --print-architecture)] https://packages.broadcom.com/artifactory/saltproject-deb/ stable main" > /etc/apt/sources.list.d/salt.list
 
 # Pin to Salt 3006 LTS
-RUN echo -e "Package: salt-*\nPin: version 3006.*\nPin-Priority: 1001" > /etc/apt/preferences.d/salt-pin-1001
+RUN printf "Package: salt-*\nPin: version 3006.*\nPin-Priority: 1001\n" > /etc/apt/preferences.d/salt-pin-1001
 
 
 # Start Systemd (systemctl)