dropbear: Add configuration file to CONFFILES

Avoid overwriting the dropbear configuration when the package gets
updated by adding it to the CONFFILES list.

Before:
root@qt5222:~# dpkg -i dropbear_2022.82-r0.26_amd64.deb
(Reading database ... 32509 files and directories currently installed.)
Preparing to unpack dropbear_2022.82-r0.26_amd64.deb ...
Unpacking dropbear (2022.82-r0.26) over (2022.82-r0.25) ...
Setting up dropbear (2022.82-r0.26) ...
update-alternatives: Linking /usr/bin/scp to /usr/sbin/dropbearmulti
update-alternatives: Linking /usr/bin/ssh to /usr/sbin/dropbearmulti

After:
root@qt5222:~# dpkg -i dropbear_2022.82-r0.27_amd64.deb
(Reading database ... 32509 files and directories currently installed.)
Preparing to unpack dropbear_2022.82-r0.27_amd64.deb ...
Unpacking dropbear (2022.82-r0.27) over (2022.82-r0.26) ...
Setting up dropbear (2022.82-r0.27) ...

Configuration file '/etc/default/dropbear'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** dropbear (Y/I/N/O/D/Z) [default=N] ?

(From OE-Core rev: e8809c00d7414faeb601970faa3e9caf5deb39cf)

Signed-off-by: Daniel Gomez <daniel@qtec.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/meta/recipes-core/dropbear/dropbear.inc b/meta/recipes-core/dropbear/dropbear.inc
index 78f9f9adbd..e170587d08 100644
--- a/meta/recipes-core/dropbear/dropbear.inc
+++ b/meta/recipes-core/dropbear/dropbear.inc
@@ -123,4 +123,6 @@ pkg_postrm:${PN} () {
   fi
 }
 
+CONFFILES:${PN} = "${sysconfdir}/default/dropbear"
+
 FILES:${PN} += "${bindir}"