chore: update env example

example.env

@@ -1,15 +1,16 @@
 ###### [Build config] ######
 # Release tag or branch name to checkout and build
-OL_BRANCH='v5.1.1'
+OL_BRANCH='main'
 
 ###### [Project config] ######
 
 # 0L Docker image
 # Available tags: https://hub.docker.com/r/nourspace/0l/tags
-OL_IMAGE='nourspace/0l:v5.1.1'
+OL_IMAGE='nourspace/0l:main'
 
 # Host path to be mounted (node_data) and used as DATA_DIR for 0L services
 OL_DATA_DIR='~/.0L/'
+OL_EPOCH_ARCHIVE_DIR='~/epoch-archive/'
 
 # Project name
 # This value is prepended along with the service name to the container on start up
@@ -26,6 +27,7 @@ OL_NODE_MODE='validator'
 
 # Enable if your fullnode/validator are not in sync so tower uses upstream instead
 #OL_TOWER_USE_FIRST_UPSTREAM='--use-first-url'
+OL_TOWER_USE_FIRST_UPSTREAM=""
 
 # To start tower in operator mode
 OL_TOWER_OPERATOR='--is-operator'
@@ -42,3 +44,9 @@ OL_TOWER_VERBOSE='--verbose'
 RUST_LOG='error'
 # Capture backtrace on error
 RUST_BACKTRACE='1'
+
+###### 0L-Tools ######
+
+# 0L-Tools Docker image
+# Available tags: https://hub.docker.com/r/nourspace/0l-tools/tags
+OL_TOOLS_IMAGE='nourspace/0l-tools:v0.1'