chore: migrate CI to GitHub Actions

.github/workflows/update-install-script.yml

@@ -0,0 +1,44 @@
+name: Synchronise Upstream Script
+
+on:
+  schedule:
+    # Runs at 02:00 UTC every Thursday (4 represents Thursday)
+    - cron: '0 2 * * 4'
+  workflow_dispatch: # Allows manual triggering to test the workflow behaviour
+
+# Grant the built-in GITHUB_TOKEN permission to push the synced script
+permissions:
+  contents: write
+
+jobs:
+  update-script:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download the latest script
+        run: |
+          # Fetch the latest installation script from Docker
+          curl -fsSL https://get.docker.com -o get-docker.sh
+
+          # Ensure the file is executable
+          chmod +x get-docker.sh
+
+      - name: Check for changes and commit
+        run: |
+          # Configure Git identity for the automated commit
+          git config user.name "onixbyte"
+          git config user.email "actions@onixbyte.dev"
+
+          # Add the script to the staging area
+          git add get-docker.sh
+
+          # Determine if any modifications have occurred
+          if git diff --staged --quiet; then
+            echo "No modifications detected. The script is currently up to date."
+          else
+            git commit -m "chore: synchronise get-docker.sh with upstream"
+            git push
+            echo "Modifications committed and pushed successfully."
+          fi