fix: improve stack path handling in staging deployment

- Fix user home directory detection for stack path expansion
- Handle tilde expansion and relative paths correctly
- Add fallback logic for path resolution

.gitea/workflows/build-image.yml

@@ -876,7 +876,6 @@ jobs:
           fi
           
           STACK_PATH="~/deployment/stacks/staging"
-          STACK_PATH="${STACK_PATH/#\~/$HOME}"
           
           echo "🚀 Starting staging deployment..."
           echo "   Image: ${SELECTED_IMAGE}"
@@ -903,9 +902,23 @@ jobs:
             REGISTRY="$5"
             shift 5
 
-            STACK_TARGET="${STACK_PATH:-~/deployment/stacks/staging}"
+            CURRENT_USER="$(whoami)"
+            USER_HOME="$(getent passwd "$CURRENT_USER" | cut -d: -f6 2>/dev/null)"
+            if [ -z "$USER_HOME" ]; then
+              USER_HOME="$HOME"
+            fi
+            if [ -z "$USER_HOME" ]; then
+              USER_HOME="/home/$CURRENT_USER"
+            fi
+
+            STACK_TARGET="$STACK_PATH"
+            if [ -z "$STACK_TARGET" ]; then
+              STACK_TARGET="$USER_HOME/deployment/stacks/staging"
+            fi
             case "$STACK_TARGET" in
-              ~*) STACK_TARGET="${HOME}${STACK_TARGET#~}" ;;
+              ~*) STACK_TARGET="${USER_HOME}${STACK_TARGET#~}" ;;
+              /*) ;;
+              *) STACK_TARGET="${USER_HOME}/${STACK_TARGET}" ;;
             esac
 
             # Ensure staging stack directory exists