✨ Add Serena update mechanism for agentic devenv

Add SERENA_UPDATE_VERSION env var (in devenv docker-compose.yml)
to dynamically update Serena on agentic devenv without requiring
an image rebuild.
Apply for update to v1.5.0 (also changing initial installation
in Dockerfile to this version).

docker/devenv/Dockerfile

@@ -190,7 +190,7 @@ ENV CLJKONDO_VERSION=2026.04.15 \
     UV_TOOL_DIR=/opt/uv/tools \
     UV_TOOL_BIN_DIR=/opt/utils/bin \
     UV_PYTHON_INSTALL_DIR=/opt/uv/python \
-    SERENA_VERSION=v1.3.0
+    SERENA_VERSION=1.5.0
 
 RUN set -ex; \
     ARCH="$(dpkg --print-architecture)"; \

docker/devenv/docker-compose.yaml

@@ -87,6 +87,10 @@ services:
       - PENPOT_LDAP_ATTRS_FULLNAME=cn
       - PENPOT_LDAP_ATTRS_PHOTO=jpegPhoto
 
+      # agentic devenv
+      # Serena update: set to a commit/tag to update Serena on startup, leave empty to skip update and use the version in the image
+      - SERENA_UPDATE_VERSION=1.5.0
+
     networks:
       default:
         aliases:

docker/devenv/files/start-tmux.sh

@@ -54,6 +54,10 @@ if echo "$PENPOT_FLAGS" | grep -q "enable-mcp"; then
 fi
 
 if [ "${SERENA_ENABLED:-false}" = "true" ]; then
+    if [ -n "${SERENA_UPDATE_VERSION}" ]; then
+        # update Serena (use sudo since the initial Serena installation is global; see Dockerfile)
+        sudo -E uv tool install -p 3.13 serena-agent@${SERENA_UPDATE_VERSION} --prerelease=allow
+    fi
     tmux new-window -t penpot:5 -n 'serena'
     tmux select-window -t penpot:5
     tmux send-keys -t penpot "serena start-mcp-server --transport streamable-http --port 14281 --project penpot --context ${SERENA_CONTEXT} --host 0.0.0.0" enter