chore: enhance image reference resolution in updater script

- Added functionality to resolve image references with digests, improving the rollback process in the updater script.
- Updated health check URLs in targets.json.example to use service names instead of localhost, ensuring proper connectivity in containerized environments.

deploy/updater/entrypoint.sh

@@ -105,6 +105,14 @@ running_image_digest() {
   if [[ -z "$image_id" ]]; then
     return 1
   fi
+
+  local repo_digest
+  repo_digest="$(docker image inspect "$image_id" --format '{{index .RepoDigests 0}}' 2>/dev/null || true)"
+  if [[ -n "$repo_digest" && "$repo_digest" == *@* ]]; then
+    printf '%s' "${repo_digest#*@}"
+    return 0
+  fi
+
   docker image inspect "$image_id" --format '{{.Id}}'
 }
 
@@ -151,7 +159,39 @@ image_with_digest() {
   local image="$1"
   local digest="$2"
   local base="${image%@*}"
-  printf '%s@%s' "$base" "$digest"
+
+  if docker image inspect "$digest" >/dev/null 2>&1; then
+    printf '%s' "$digest"
+    return 0
+  fi
+
+  local repo="$base"
+  if [[ "$base" == *:* ]]; then
+    repo="${base%:*}"
+  fi
+
+  local ref="${repo}@${digest}"
+  if docker image inspect "$ref" >/dev/null 2>&1; then
+    printf '%s' "$ref"
+    return 0
+  fi
+
+  printf '%s' "$ref"
+}
+
+resolve_image_ref() {
+  local image="$1"
+  local digest="$2"
+  local ref
+  ref="$(image_with_digest "$image" "$digest")"
+
+  if docker image inspect "$ref" >/dev/null 2>&1; then
+    printf '%s' "$ref"
+    return 0
+  fi
+
+  docker pull "$ref" >/dev/null
+  printf '%s' "$ref"
 }
 
 build_run_args_from_snapshot() {
@@ -303,7 +343,12 @@ restore_container() {
 
   docker rm -f "$container_name" >/dev/null 2>&1 || true
   if [[ -n "$previous_digest" ]]; then
-    run_container_from_snapshot "$container_name" "$snapshot_file" "$(image_with_digest "$image" "$previous_digest")" || {
+    local rollback_image
+    if ! rollback_image="$(resolve_image_ref "$image" "$previous_digest")"; then
+      log error "target=${target_id} action=rollback_failed reason=image_unavailable digest=${previous_digest}"
+      return 1
+    fi
+    run_container_from_snapshot "$container_name" "$snapshot_file" "$rollback_image" || {
       log error "target=${target_id} action=rollback_failed"
       return 1
     }

deploy/updater/targets.json.example

@@ -6,7 +6,7 @@
       "image": "git.shts.su/denozord/mikrotikmanager-backend:latest",
       "health": {
         "type": "http",
-        "url": "http://127.0.0.1:8000/health",
+        "url": "http://backend:8000/health",
         "expect_status": 200
       }
     },
@@ -16,7 +16,7 @@
       "image": "git.shts.su/denozord/mikrotikmanager-frontend:latest",
       "health": {
         "type": "http",
-        "url": "http://127.0.0.1:3000/",
+        "url": "http://frontend:3000/",
         "expect_status": 200
       }
     }