CI: fix Debian tag revision leaking to non-tagged packages

.ci/upload.sh

@@ -17,6 +17,7 @@ function prepare_upload_filename() {
   .ci/detect_os_arch_package_format "$package" > /tmp/os_arch_package_format;
   source /tmp/os_arch_package_format;
   detect_release_branch
+
   detect_revision "$package" "$OS_ARCH"
   if [ -n "$REVISION" ]; then
     REVISION="_${REVISION}"
@@ -60,6 +61,8 @@ detect_revision() {
   local package="$1"
   local arch="$2"
 
+  REVISION=
+
   if ! echo "$package" | grep -q '+'; then
     return
   fi