Optimize devcontainer for faster startup

- Disabled package upgrades (upgradePackages: false)
- Removed heavy features: kubectl-helm-minikube, sshd
- Changed Git to os-provided version for faster builds
- Removed unnecessary packages from Dockerfile
- Removed docker-compose.yml for simpler single-container setup
- Streamlined postCreateCommand
- Removed heavy VS Code extensions
- Added setup-optional-tools.sh for on-demand tool installation
- Added dependabot.yml for dependency management

Estimated startup time reduced from 4-6 minutes to 1-2 minutes.

Signed-off-by: Ihor Dvoretskyi <ihor@linux.com>

Author: idvoretskyi

.devcontainer/Dockerfile

@@ -1,18 +1,14 @@
 FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
 
-# Install essential packages and set up directories
-# hadolint ignore=DL3008
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     && apt-get -y install --no-install-recommends \
         curl \
         wget \
         jq \
         build-essential \
-        openssh-server \
-        tcl \
     && apt-get clean -y \
-    && rm -rf /var/lib/apt/lists/* \
-    && mkdir -p /run/sshd \
-    && mkdir -p /home/vscode/.ssh \
-    && chown -R vscode:vscode /home/vscode/.ssh \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /home/vscode/.ssh \
+    && chown -R vscode:vscode /home/vscode \
     && chmod 700 /home/vscode/.ssh

.devcontainer/devcontainer.json

@@ -9,10 +9,10 @@
         "ghcr.io/devcontainers/features/common-utils:2": {
             "installZsh": true,
             "username": "vscode",
-            "upgradePackages": true
+            "upgradePackages": false
         },
         "ghcr.io/devcontainers/features/git:1": {
-            "version": "latest",
+            "version": "os-provided",
             "ppa": false
         },
         "ghcr.io/devcontainers/features/node:1": {
@@ -25,14 +25,6 @@
             "moby": true,
             "dockerDashComposeVersion": "v2"
         },
-        "ghcr.io/devcontainers/features/kubectl-helm-minikube:1": {
-            "version": "latest",
-            "helm": "latest",
-            "minikube": "latest"
-        },
-        "ghcr.io/devcontainers/features/sshd:1": {
-            "version": "latest"
-        },
         "ghcr.io/devcontainers/features/github-cli:1": {
             "version": "latest"
         }
@@ -43,9 +35,7 @@
                 "ms-azuretools.vscode-docker",
                 "github.copilot",
                 "github.copilot-chat",
-                "redhat.vscode-yaml",
-                "ms-kubernetes-tools.vscode-kubernetes-tools",
-                "blinksh.blink-fs"
+                "redhat.vscode-yaml"
             ],
             "settings": {
                 "editor.formatOnSave": true,
@@ -57,8 +47,6 @@
             }
         }
     },
-    "forwardPorts": [22],
-    "postCreateCommand": "npm install -g @anthropic-ai/claude-code@latest && echo '🚀 Development environment ready! Docker, Kubernetes (Minikube), Claude Code, and SSH are configured.' && sudo service ssh start",
-    "postStartCommand": "sudo service ssh restart",
+    "postCreateCommand": "echo 'Development environment ready'",
     "remoteUser": "vscode"
 }

.devcontainer/docker-compose.yml

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+echo "Installing optional development tools..."
+
+# Uncomment if needed:
+# npm install -g @anthropic-ai/claude-code@latest
+
+# Uncomment if needed:
+# pip3 install --user black pylint pytest
+
+echo "Optional tools installation complete"

.devcontainer/setup-optional-tools.sh

@@ -0,0 +1,20 @@
+# Keep devcontainer dependencies up to date
+version: 2
+updates:
+  # Monitor GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"
+      - "github-actions"
+
+  # Monitor Docker base images
+  - package-ecosystem: "docker"
+    directory: "/.devcontainer"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"
+      - "docker"

.github/dependabot.yml

@@ -3,29 +3,79 @@
 [![CI](https://github.com/idvoretskyi/dev/actions/workflows/ci.yml/badge.svg)](https://github.com/idvoretskyi/dev/actions/workflows/ci.yml)
 [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/idvoretskyi/dev)
 
-This repository serves as a default generic GitHub Codespace template.
+This repository serves as an optimized GitHub Codespaces template for general development workflows.
 
 ## Features
 
 - Base image: Ubuntu 24.04
-- Pre-installed development tools
-- VS Code extensions for productivity
-- Configured with sensible defaults
+- Essential development tools:
+  - Git (OS-provided)
+  - Node.js LTS
+  - Docker-in-Docker
+  - GitHub CLI
+  - Zsh with common utilities
+- VS Code extensions:
+  - Docker support
+  - GitHub Copilot
+  - YAML support
+
+## Performance Optimizations
+
+The devcontainer is optimized for fast startup:
+
+- Disabled package upgrades during build
+- Removed heavy features (kubectl, helm, minikube, sshd)
+- Removed unnecessary Docker packages
+- Minimal postCreateCommand
+- Essential VS Code extensions only
+
+Estimated startup time: 1-2 minutes
 
 ## Usage
 
+### GitHub Codespaces
 1. Click "Code" button on the GitHub repository
 2. Select "Create codespace on main"
 3. Wait for the environment to build
-4. Start coding!
 
-## Customization
+### VS Code Local Dev Containers
+1. Clone this repository
+2. Open in VS Code
+3. Click "Reopen in Container" when prompted
+
+## Using as a Template
+
+### Method 1: GitHub Template
+Click "Use this template" button to create a new repository
+
+### Method 2: Copy Configuration
+```bash
+cp -r .devcontainer /path/to/your/project/
+```
+
+### Customization
+
+Edit `.devcontainer/devcontainer.json` to add features:
+
+```json
+{
+  "features": {
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.11"
+    }
+  },
+  "postCreateCommand": "pip install -r requirements.txt"
+}
+```
+
+## Optional Tools
 
-You can customize this environment by:
+Install additional tools as needed:
+```bash
+bash .devcontainer/setup-optional-tools.sh
+```
 
-- Modifying `.devcontainer/devcontainer.json` to add VS Code extensions or settings
-- Editing `.devcontainer/Dockerfile` to install additional packages
-- Updating `.devcontainer/docker-compose.yml` to add services like databases
+Edit the script to customize which tools to install.
 
 ## License