test(rust): add bats test to check we can enroll with previous versions

implementations/rust/ockam/ockam_command/tests/bats/orchestrator_enroll/back_compatibility.bats

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# ===== SETUP
+
+setup() {
+  load ../load/base.bash
+  load ../load/orchestrator.bash
+  load_bats_ext
+  setup_home_dir
+  skip_if_orchestrator_tests_not_enabled
+  copy_enrolled_home_dir
+}
+
+teardown() {
+  teardown_home_dir
+}
+
+# ===== TESTS
+
+@test "backcompat - generate ticket, enroll with old version" {
+  latest_version=$($OCKAM --version | grep -o 'ockam [0-9]*\.[0-9]*\.[0-9]*' | sed 's/ockam //')
+  latest_minor_version=$(echo $latest_version | cut -d. -f2)
+  versions_to_check=$(seq -f "0.%g.0" $((latest_minor_version - 5)) $((latest_minor_version - 1)))
+  for version in $versions_to_check; do
+    echo "Testing enrollment ticket with ockam version $version" >&3
+    container_name=$(random_str)
+    port=$(random_port)
+    node_name=$(random_str)
+    relay_name=$(random_str)
+    docker run -d --name $container_name -p $port:$port \
+      ghcr.io/build-trust/ockam:$version node create --foreground \
+      --enrollment-ticket "$($OCKAM project ticket --relay $relay_name)" \
+      --configuration "{name: $node_name, relay: $relay_name}" \
+      -vvv
+    sleep 10
+    run $OCKAM message send hi --to /project/default/service/forward_to_${relay_name}/secure/api/service/echo
+    response=$output
+    docker kill $container_name
+    docker rm $container_name
+    assert_equal "$response" "hi"
+  done
+}