deploy-coder-templates.yaml

name: Deploy Coder Templates
on:
  push:
    branches: [ main ]
    paths: [ 'templates/**' ] # Only run if the files int eh templates folder change
  workflow_dispatch:

jobs:
  # Detect which templates actually changed
  detect-changes:
    runs-on: coder-runner-set
    outputs: 
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Get changed template directories
        id: set-matrix
        run: |
          # Finds all unique directories under /templates that had changes 
          # Formats them into a JSON array: ["project1", "project2"]
          DIRS=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | \
                   grep '^templates/' | cut -d/ -f2 | sort -u | jq -R -s -c 'split("\n")[:-1]')
          echo "matrix=$DIRS" >> $GITHUB_OUTPUT 

  # Push only the changed templates
  deploy:
    needs: detect-changes
    if: ${{ needs.detect-changes.outputs.matrix != '[]' }} # Skips if no templates changed
    runs-on: coder-runner-set
    strategy:
      matrix: 
        template: ${{ fromJson(needs.detect-changes.outputs.matrix) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      
      - name: Setup Terraform  
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: "1.7.0"

      - name: Install Coder CLI
        run: curl -L https://coder.com/install.sh | sh

      - name: Push Template to Coder
        env:
          CODER_SESSION_TOKEN: ${{ secrets.CODER_SESSION_TOKEN }}
          CODER_URL: ${{ vars.CODER_URL }}
        run: |
          # Authenticate with token
          coder login $CODER_URL --token $CODER_SESSION_TOKEN

          coder templates push ${{ matrix.template }} \
            --directory ./templates/${{ matrix.template }} \
            --yes \
            --activate \
            --ignore-lockfile