kubectl packed as "GitHub" action

use it like this:

name: Deploy homepage
on:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: https://git.novotna.dev/viky/kubectl-action@v0.0.1
        with:  
          kubeconfig: "${{ secrets.KUBECONFIG }}"
          namespace: default
          command_line: apply -f homepage-external.yaml