build: add image publishing

Author: inkjesse

.github/workflows/pull_request.yaml renamed to .github/workflows/cicd.yaml

@@ -1,5 +1,10 @@
-name: PR Checks
-on: [pull_request]
+name: CI/CD Workflow
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
 jobs:
   install_modules:
     runs-on: ubuntu-latest
@@ -77,3 +82,31 @@ jobs:
         name: Base Setup
       - name: Building app
         run: pnpm run build
+
+  docker-publish:
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/inkonchain/docs:latest
+
+      - name: Log out from GitHub Container Registry
+        run: docker logout ghcr.io