Mark crucial packages as protected

Closes #73

debian/control

@@ -15,6 +15,7 @@ Homepage: https://source.puri.sm/Librem5/librem5-base
 Package: librem5-base
 Architecture: all
 Priority: optional
+Protected: yes
 Depends:
  librem5-base-defaults (>= ${source:Version}),
  ${germinate:Depends},
@@ -29,6 +30,7 @@ Description: Metapackage for the Librem5
 Package: librem5-gnome-base
 Architecture: all
 Priority: optional
+Protected: yes
 Depends:
  librem5-base (>= ${source:Version}),
  ${germinate:Depends},
@@ -42,6 +44,7 @@ Description: GNOME base metapackage for the Librem5
 
 Package: librem5-gnome-phone
 Architecture: all
+Protected: yes
 Depends:
  ${germinate:Depends},
  ${misc:Depends},
@@ -55,6 +58,7 @@ Description: GNOME PTSN telephony metapackage for the Librem5
 
 Package: librem5-gnome
 Architecture: all
+Protected: yes
 Depends:
  ${germinate:Depends},
  ${misc:Depends},
@@ -79,6 +83,7 @@ Description: GNOME notfit metapackage for the Librem5
 
 Package: librem5-non-gnome
 Architecture: all
+Protected: yes
 Depends:
  ${germinate:Depends},
  ${misc:Depends},
@@ -133,6 +138,7 @@ Description: Librem5 GNOME debug packages
 Package: librem5-base-defaults
 Architecture: all
 Section: x11
+Protected: yes
 Depends:
  adduser,
  gnome-themes-extra-data,