ci: add homelab docker workflow for beta image

.github/workflows/homelab-docker-build.yml

@@ -0,0 +1,45 @@
+name: Homelab Docker Build
+
+on:
+  push:
+    branches:
+      - homelab
+      - homelab-postgres
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push homelab image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: |
+            ghcr.io/kevingatera/audiobookshelf:${{ github.ref_name }}
+            ghcr.io/kevingatera/audiobookshelf:${{ github.ref_name }}-${{ github.sha }}
+          labels: |
+            org.opencontainers.image.source=https://github.com/kevingatera/audiobookshelf
+            org.opencontainers.image.revision=${{ github.sha }}