feat: action to deploy when new file is added

Signed-off-by: Tsung-Ju Lii <[email protected]>

Author: usefulalgorithm

.github/workflows/deploy.yaml

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+name: Deploy personal website
+
+on:
+  workflow_dispatch:
+  push: # If there's anything new in `posts`, run this action to trigger the deployment.
+    paths:
+      - 'posts/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    environment: deployment
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: haskell-actions/[email protected]
+        with:
+          ghc-version: 9.8.4
+          enable-stack: true
+          stack-setup-ghc: true
+
+      - run: |
+          stack build
+          stack exec site build
+
+      - run: |
+          if [[ $(git status --porcelain docs/) ]]; then
+            git config --global user.name "github-actions[bot]"
+            git config --global user.email "github-actions[bot]@users.noreply.github.com"
+            git add docs/
+            if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+              git commit -m "Update site at $(date)"
+            else
+              new_post=$(git diff --name-only HEAD^ | grep 'posts/')
+              git commit -m "Add new post: ${new_post}"
+            fi
+            git push origin main
+          else
+            echo "No changes in docs/ directory"
+          fi

posts/2025-02-27-restructured-and-automated.md

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+---
+title: Restructured and Added Some Automation for This Blog
+layout: post
+comments: false
+tags: about this blog
+---
+
+I have been avoiding changing things up in this blog even though I really should have done this a long time ago. There were several things I did not like so much about it:
+
+### Having to Have a Working Haskell Environment
+
+To actually generate the site, I needed to do the following:
+
+- `stack build` - this builds the executable called `site` that consumes content in `posts/` and churns out HTML files.
+- `stack exec site build` - this runs the `site` executable and builds the HTML files, which are stored in `_site/`.
+
+Since everything is built offline, a working Haskell environment was necessary.
+
+### Lots of Manual Steps
+
+As stated above, since the generated HTML files are in `_site/`, I needed to find a way to get GH pages to host them. The way I did it was to have [another separate repo](https://github.com/usefulalgorithm/old-website), make sure `_site/` is pointing to that repo, then run `stack exec site build`, check that things are generated correctly in `_site`, and finally push to both this repo and the actual GH pages repo.
+
+---
+
+Now that I'm not employed and have some free time, I decided it was finally time to make it more usable and generally encourage myself to post more often. Here's what I did:
+
+### Deprecate the Old GH Pages Repo and Just Use This One
+
+This should be quite obvious - there's a [tutorial](https://jaspervdj.be/hakyll/tutorials/github-pages-tutorial.html) that tells you how to change your executable's target directory from `_site/` to `docs/`. I can just ditch the old repo, rename the Haskell repo to `usefulalgorithm.github.io`, and have its page deployed from `docs/` in the main branch. I'm pretty sure the directory has to be called `docs/` and not anything else though.
+
+### Build & Deploy from GH Actions
+
+I've done a bunch of GH actions in my previous job and found them to be a huge time saver. So what I wanted to do is just update Markdown files in `posts/`, and then trigger the Haskell commands from within the action runner.
+
+## What Will Be Done (Hopefully in the Near Future)
+
+### Post via PRs
+
+Writing Markdown files is still a little annoying, especially when I'm on my phone and just want to post something to my blog. I want to find a way to create posts through pull requests, but I need to think about where to put things like tags and how to format the pull request message into a proper Markdown file.
+
+### Repost to Threads (and Possibly Other Platforms)
+
+More often than not, I would repost the published post to my socials. I know social media is like the worst thing that's happened in 20 years, but I still want people to read what I have to say.