include/dts-functions.sh: introduce DTS_CONFIG_REF variable for CI tests

Signed-off-by: Artur Raglis <artur.raglis@3mdeb.com>

include/dts-environment.sh

@@ -181,6 +181,8 @@ declare HEADS_SWITCH_FLASHROM_OPT_OVERRIDE
 declare PLATFORM_SIGN_KEY
 
 # Other variables:
+# dts-scripts config path
+declare DTS_CONFIG_REF="${DTS_CONFIG_REF:-/refs/heads/main}"
 # Default values for flash chip related information:
 declare FLASH_CHIP_SELECT
 declare FLASH_CHIP_SIZE

include/dts-functions.sh

@@ -234,7 +234,7 @@ board_config() {
 
   echo "Downloading board configs repository"
   mkdir -p "$BOARD_CONFIG_PATH"
-  curl -L -o "$BOARD_CONFIG_PATH.tar.gz" https://github.com/Dasharo/dts-configs/archive/refs/heads/main.tar.gz >/dev/null 2>>"$ERR_LOG_FILE"
+  curl -L -o "$BOARD_CONFIG_PATH.tar.gz" https://github.com/Dasharo/dts-configs/archive/${DTS_CONFIG_REF}.tar.gz >/dev/null 2>>"$ERR_LOG_FILE"
   if [ $? -ne 0 ]; then
     print_error "Failed to download configs."
     return 1