Update DO app spec for Jekyll production build and add GitHub Actions workflow

.do/app.yaml

@@ -1,8 +1,7 @@
 name: simcoetradesjournal
 static_sites:
 - name: simcoetradesjournal
-  build_command: bundle exec jekyll build
-  environment_slug: jekyll
+  build_command: JEKYLL_ENV=production bundle exec jekyll build
   output_dir: _site
   github:
     branch: main

.do/deploy.template.yaml

@@ -2,8 +2,7 @@ spec:
   name: simcoetradesjournal
   static_sites:
   - name: simcoetradesjournal
-    build_command: bundle exec jekyll build
-    environment_slug: jekyll
+    build_command: JEKYLL_ENV=production bundle exec jekyll build
     output_dir: _site
     git:
       branch: main

.github/workflows/deploy.yml

@@ -0,0 +1,29 @@
+name: Build Jekyll Site
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+          bundler-cache: true
+
+      - name: Build site with Jekyll
+        run: |
+          JEKYLL_ENV=production bundle exec jekyll build
+        env:
+          JEKYLL_ENV: production