[#245] Ignore debian/changelog for clean builds

Changes in debian/changelog produce `-dirty` suffix
in version.

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

.gitignore

@@ -22,6 +22,7 @@ coverage.html
 
 # debian package build files
 debian/files
+debian/changelog
 debian/*.log
 debian/*.substvars
 debian/frostfs-s3-gw/

Makefile

@@ -160,6 +160,7 @@ protoc:
 
 # Package for Debian
 debpackage:
+	cp debian/changelog.init debian/changelog
 	dch --package frostfs-s3-gw \
 			--controlmaint \
 			--newversion $(PKG_VERSION) \