always use HEAD reference for generating Debian tarball

Author: rcsanchez97

debian/gbp.conf

@@ -11,14 +11,9 @@ prebuild = bash -c "
     # Determine list of embedded sources to exclude from Debian source package
     zlib_filter_files=\"$(find src/zlib-* -mindepth 1 -maxdepth 1 \! -name zconf.h.in -printf "mongo-c-driver-\${upstream_version}/%p ")\" &&
     zlib_rm_files=\"$(find src/zlib-* -mindepth 1 -maxdepth 1 \! -name zconf.h.in -printf '%p ')\" &&
-    # Determine if we are on a release branch and set the reference to use later
-    # to create the upstream tarball (when on a release branch use the most
-    # recent release tag, and when on any other branch use HEAD)
-    release_branch=$(cd $GBP_GIT_DIR/..; git symbolic-ref --short HEAD | sed -n '/^r[0-9]\./p') &&
-    if [ -n \"\${release_branch}\" ]; then archive_ref=$(cd $GBP_GIT_DIR/..; git describe --tags --abbrev=0 --match '1.*'); else archive_ref=HEAD; fi &&
     # Create upstream tarball from reference, exclude items that do not belong
     pushd $GBP_GIT_DIR/.. &&
-    git archive --format=tar --prefix=mongo-c-driver-\${upstream_version}/ \${archive_ref} | tar -f - --delete mongo-c-driver-\${upstream_version}/debian \$zlib_filter_files | gzip > $GBP_BUILD_DIR/../mongo-c-driver_\${upstream_version}.orig.tar.gz &&
+    git archive --format=tar --prefix=mongo-c-driver-\${upstream_version}/ HEAD | tar -f - --delete mongo-c-driver-\${upstream_version}/debian \$zlib_filter_files | gzip > $GBP_BUILD_DIR/../mongo-c-driver_\${upstream_version}.orig.tar.gz &&
     popd &&
     rm -rf \$zlib_rm_files"