support docker deployment

Author: jbrodriguez

.env.example

@@ -0,0 +1,20 @@
+# Environment variables for mediagui Docker deployment
+
+# Media folders to scan (comma-separated)
+MEDIA_FOLDERS=/media/movies,/media/tv
+
+# Unraid hosts to monitor (comma-separated)
+UNRAID_HOSTS=unraid.local:8080
+
+# User agent for API requests
+USER_AGENT=mediagui/1.0
+
+# TMDB API key for movie metadata
+TMDB_KEY=your_tmdb_api_key_here
+
+# Data directory for application files (default: /data in container)
+DATA_DIR=/data
+
+# User and group IDs for file permissions
+USER_ID=1000
+GROUP_ID=1000

.github/workflows/docker-build.yml

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+name: Docker Build and Push
+
+on:
+  push:
+    branches: [ main ]
+    tags: [ 'v*' ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Log in to Container Registry
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=sha,prefix={{branch}}-
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+          type=raw,value=latest,enable={{is_default_branch}}
+
+    - name: Generate version
+      id: version
+      run: |
+        if [ "${{ github.event_name }}" == "push" ] && [[ "${{ github.ref }}" == refs/tags/* ]]; then
+          VERSION="${{ github.ref_name }}"
+        else
+          MB_DATE=$(date '+%Y.%m.%d')
+          MB_HASH=$(git rev-parse --short HEAD)
+          VERSION="$MB_DATE-$MB_HASH"
+        fi
+        echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        platforms: linux/amd64
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        build-args: |
+          VERSION=${{ steps.version.outputs.version }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max