Improve snapshot version schema

Use 1.6.999 as base version, with GIT details after.

get_snapshot

@@ -54,10 +54,18 @@ if [ -z "$UPSTREAM_GIT_NOREPO" ]; then
         echo "Missing '${PROJECT}.git' directory!" >&2
         exit 1
     fi
+else
+    cd "${PROJECT}.git"
 fi
 
 git_version=$(git describe --tags "${UPSTREAM_GIT_BRANCH}")
 package_version=$(echo "$git_version" | sed -e 's/^v//' -e 's/-/./g')
+
+# increase version for snapshots
+major_version="$(echo "$package_version" | cut -d. -f1-2)"
+git_suffix="$(echo "$package_version" | cut -d. -f4-)"
+package_version="${major_version}.999.${git_suffix}"
+
 tarball="${workdir}/${PROJECT}-${package_version}.tar"
 
 git archive --format=tar --prefix="${PROJECT}-${package_version}/" -o "${tarball}" "${UPSTREAM_GIT_BRANCH}"