Use precompiled Python via apt (faster spin-up) (#11)

* Use OS precompiled Python instead of source builds

- Remove devcontainer Python feature (pyenv/source build)
- Install python3, python3-venv, python3-pip via apt in Dockerfile
- Remove apt-get upgrade to keep builds fast and pass hadolint
- Update README to note OS-provided Python

Speeds up Codespaces spin-up by avoiding compilation.

Signed-off-by: Ihor Dvoretskyi <[email protected]>

* Dockerfile: restore apt-get upgrade step

Re-add apt-get -y upgrade --no-install-recommends after update per request.
Also expand hadolint ignore to DL3008,DL3009 to avoid false-positive lints.

Signed-off-by: Ihor Dvoretskyi <[email protected]>

* Update .devcontainer/Dockerfile

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Ihor Dvoretskyi <[email protected]>

---------

Signed-off-by: Ihor Dvoretskyi <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: idvoretskyi

.devcontainer/Dockerfile

@@ -8,6 +8,9 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
         wget \
         jq \
         build-essential \
+        python3 \
+        python3-venv \
+        python3-pip \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/*
 

.devcontainer/devcontainer.json

@@ -15,10 +15,6 @@
             "version": "os-provided",
             "ppa": false
         },
-        "ghcr.io/devcontainers/features/python:1": {
-            "version": "3.12",
-            "installTools": true
-        },
         "ghcr.io/devcontainers/features/node:1": {
             "version": "lts",
             "nodeGypDependencies": false,

README.md

@@ -32,6 +32,7 @@ The devcontainer balances speed with operability:
 - Disabled package upgrades during build
 - Removed heavy features (kubectl, helm, minikube, sshd)
 - Uses OS-provided Git for faster builds
+- Uses OS-provided Python (precompiled) for faster setup
 - Installs Claude Code CLI via npm in postCreateCommand
 - Core VS Code extensions only