GitHub action for deploying to prose.sh

Problem #

Simple GitHub action for publishing articles to prose.sh.

Solution #

Use the following action:

 1## File: .github/workflows/publish.yaml
 2name: Publish blog
 3"on":
 4  push:
 5    branches:
 6      - main
 7jobs:
 8  publish:
 9    runs-on: ubuntu-latest
10    permissions:
11      contents: read
12    steps:
13      - uses: actions/checkout@v5
14        with:
15          fetch-depth: 2
16      - uses: webfactory/ssh-agent@v0.9.1
17        with:
18          ssh-private-key: ${{ secrets.PICO_PRIVATE_KEY }}
19      - id: modified-files
20        run: echo "articles=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }} -- '*.md' | tr '\n' ' ')" >> "$GITHUB_OUTPUT"
21      - run: rsync -e 'ssh -o StrictHostKeyChecking=no' ${{ steps.modified-files.outputs.articles }} prose.sh:/

Explanation #

A private key is required to authenticate with the remote server. The private key is stored as a secret in the GitHub repository settings. Only markdown files that were modified since the last commit will be published to prose.sh.

Considerations #

This action works on push events. If you use pull_request events, you can update the "articles" echo command to git diff --name-only HEAD^1 HEAD -- '*.md' instead.