ci: add docker build on schedule and on push

.github/workflows/docker-build.yml

@@ -0,0 +1,44 @@
+name: Create and publish a Docker image
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: acaslab/pterodactyl-panel
+
+on:
+  schedule:
+    - cron: '0 4 * * *'
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: "{{defaultContext}}:docker"
+          push: true
+          tags: latest
+          labels: ${{ steps.meta.outputs.labels }}