Add my-team-setup devcontainer feature with GHA publish workflow

- Installs Python3 with common packages (requests, numpy, pandas)
- Adds 'Hello World!' to terminal prompt
- GitHub Actions workflow publishes to ghcr.io

Co-authored-by: Ona <[email protected]>

Author: meysholdt

.github/workflows/publish.yml

@@ -0,0 +1,31 @@
+name: Publish Dev Container Feature
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish Features
+        uses: devcontainers/action@v1
+        with:
+          publish-features: true
+          base-path-to-features: ./src

src/my-team-setup/devcontainer-feature.json

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+{
+    "id": "my-team-setup",
+    "version": "1.0.0",
+    "name": "My Team Setup",
+    "description": "Installs Python3 with common packages and adds 'Hello World!' to the terminal prompt",
+    "options": {
+        "packages": {
+            "type": "string",
+            "default": "requests numpy pandas",
+            "description": "Space-separated list of Python packages to install"
+        }
+    },
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/common-utils"
+    ]
+}

src/my-team-setup/install.sh

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+#!/bin/bash
+set -e
+
+PACKAGES="${PACKAGES:-requests numpy pandas}"
+
+echo "Installing Python3..."
+apt-get update
+apt-get install -y python3 python3-pip python3-venv
+
+echo "Installing Python packages: $PACKAGES"
+pip3 install --break-system-packages $PACKAGES
+
+echo "Configuring terminal prompt with 'Hello World!'..."
+
+# Add prompt customization to /etc/bash.bashrc for all users
+cat >> /etc/bash.bashrc << 'EOF'
+
+# Added by my-team-setup devcontainer feature
+export PS1="Hello World! \$PS1"
+EOF
+
+# Also add to /etc/zsh/zshrc if zsh is available
+if [ -d /etc/zsh ]; then
+    cat >> /etc/zsh/zshrc << 'EOF'
+
+# Added by my-team-setup devcontainer feature
+export PS1="Hello World! $PS1"
+EOF
+fi
+
+echo "my-team-setup feature installed successfully!"