Add GitHub Actions workflow for building and publishing

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Build and Publish TVJ EPG Image
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Podman
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y podman
+
+      - name: Log in to GitHub Container Registry
+        run: |
+          echo "${{ secrets.GHCR_TOKEN }}" | podman login ghcr.io \
+            -u ${{ github.actor }} \
+            --password-stdin
+
+      - name: Build image with Podman
+        run: |
+          podman build \
+            -f Containerfile \
+            -t ghcr.io/${{ github.repository }}:latest \
+            .
+
+      - name: Push image to GHCR
+        run: |
+          podman push ghcr.io/${{ github.repository }}:latest