What are Reusable Workflows in GitHub Actions?

Question

Accepted Answer

**Reusable Workflows** — reusing workflows across repositories.

**Reusable workflow (in the infra repository):**
```yaml
name: Deploy to K8s
on:
  workflow_call:
    inputs:
      environment:
        required: true
        type: string
      image_tag:
        required: true
        type: string
    secrets:
      kubeconfig:
        required: true

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - run: |
          echo "${{ secrets.kubeconfig }}" > kubeconfig
          export KUBECONFIG=kubeconfig
          kubectl set image deployment/myapp myapp=myapp:${{ inputs.image_tag }} -n ${{ inputs.environment }}
```

**Calling from another repository:**
```yaml
jobs:
  deploy:
    needs: build
    uses: org/infra/.github/workflows/deploy.yml@main
    with:
      environment: production
      image_tag: ${{ needs.build.outputs.image_tag }}
    secrets:
      kubeconfig: ${{ secrets.KUBECONFIG }}
```

**Advantages:** DRY, centralized logic, easy updates.

DevOps: What are Reusable Workflows in GitHub Actions?