Add GitHub CI build script

.github/workflows/build.yml

@@ -0,0 +1,49 @@
+name: build
+on:
+  pull_request:
+    paths:
+      - '!**'
+      - '.github/workflows/build.yml'
+      - 'Makefile'
+      - 'hackernews.el'
+  push:
+    paths:
+      - '!**'
+      - '.github/workflows/build.yml'
+      - 'Makefile'
+      - 'hackernews.el'
+permissions: {}
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        emacs_version:
+          - 23.4
+          - 24.1
+          - 24.2
+          - 24.3
+          - 24.4
+          - 24.5
+          - 25.1
+          - 25.2
+          - 25.3
+          - 26.1
+          - 26.2
+          - 26.3
+          - 27.1
+          - 27.2
+          - 28.1
+          - 28.2
+          - 29.1
+          - release-snapshot
+          - snapshot
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        persist-credentials: false
+    - uses: purcell/setup-emacs@master
+      with:
+        version: ${{ matrix.emacs_version }}
+    - name: Byte-compile
+      run: make

AUTHORS

@@ -4,6 +4,7 @@ appreciation for their public spirit, we list here in alphabetical
 order a condensed list of their contributions.
 
 Basil L. Contovounesios: wrote .dir-locals.el
+  .github/workflows/build.yml
 and added AUTHORS
 and changed .gitignore Makefile README.md Screenshot.png
   hackernews-pkg.el hackernews.el

README.md

@@ -1,5 +1,6 @@
 # Simple Hacker News Emacs Client
 
+[![Build](https://github.com/clarete/hackernews.el/actions/workflows/build.yml/badge.svg)](https://github.com/clarete/hackernews.el/actions/workflows/build.yml)
 [![MELPA](https://melpa.org/packages/hackernews-badge.svg)](https://melpa.org/#/hackernews)
 [![MELPA Stable](https://stable.melpa.org/packages/hackernews-badge.svg)](https://stable.melpa.org/#/hackernews)