gh-138: Run contextualization only from CDROM

(apply udev changes to Debians and Alpines)

src/lib/udev/rules.d/65-context.rules##apk.one

@@ -4,6 +4,7 @@ SUBSYSTEM=="net", ACTION=="add", \
 
 # On CONTEXT CD-ROM change the immediate reconfiguration is triggered.
 SUBSYSTEM=="block", ACTION=="change", \
+  ENV{ID_CDROM}=="1", \
   ENV{ID_FS_TYPE}=="iso9660" ENV{ID_FS_LABEL_ENC}=="CONTEXT", \
   RUN+="/sbin/service one-context-reconfigure restart"
 

src/lib/udev/rules.d/65-context.rules##deb.one

@@ -7,6 +7,7 @@ SUBSYSTEM=="net", ACTION=="add", \
 # every second event and triggers systemd service one-context-reconfigure.
 # This service also stops any existing delayed reconfiguration.
 SUBSYSTEM=="block", ACTION=="change", \
+  ENV{ID_CDROM}=="1", \
   ENV{ID_FS_TYPE}=="iso9660" ENV{ID_FS_LABEL_ENC}=="CONTEXT", \
   ENV{SEQNUM}=="*[02468]", \
   RUN+="/usr/sbin/service one-context-reconfigure start"