feat: add dockerfile with github workflow to rebuild

ci: hopefully fix workflow

.github/workflows/rebuild.yml

@@ -0,0 +1,57 @@
+name: Rebuild Caddy Git
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/rebuild.yml'
+      - 'Dockerfile'
+      - 'Caddyfile'
+  schedule:
+    - cron: "20 */4 * * *"
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  rebuild-caddy:
+    name: Rebuild and Push Caddy Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/caddy
+          tags: |
+            type=raw,value=latest
+            type=sha,prefix={{date 'YYYYMMDDHHmmss'}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          platforms: linux/amd64,linux/arm64

Dockerfile

@@ -0,0 +1,3 @@
+FROM caddy:2-alpine
+
+RUN apk add --no-cache nss-tools

README.md

@@ -1 +1,20 @@
 # dockerfile-caddy
+
+```yml
+services:
+  caddy:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - ./certs:/certs:ro
+      - caddy_data:/data
+      - caddy_config:/config
+
+volumes:
+  caddy_data:
+  caddy_config:
+```