feat: update GitHub Actions workflow for Docker image build and add Docker installation instructions to README

.github/workflows/docker.yml

@@ -2,38 +2,39 @@ name: Build and Publish Docker Image
 
 on:
   push:
-    branches:
-      - main
-      - master
-    paths:
+    branches: [main, master]
+    paths: # run only when this file changed at all
       - "unshackle/core/__init__.py"
-      - "Dockerfile"
-      - "pyproject.toml"
-      - "uv.lock"
-      - ".github/workflows/docker.yml"
-    tags:
-      - "v*"
-  pull_request:
-    branches:
-      - main
-      - master
-    paths:
-      - "unshackle/core/__init__.py"
-      - "Dockerfile"
-      - "pyproject.toml"
-      - "uv.lock"
-      - ".github/workflows/docker.yml"
-
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
+  pull_request: {} # optional – delete if you don’t build on PRs
+  workflow_dispatch: {} # manual override
 
 jobs:
-  build-and-push:
+  detect-version-change:
     runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
+    outputs:
+      changed: ${{ steps.vdiff.outputs.changed }}
+      version: ${{ steps.vdiff.outputs.version }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with: { fetch-depth: 2 } # we need the previous commit :contentReference[oaicite:1]{index=1}
+
+      - name: Extract & compare version
+        id: vdiff
+        shell: bash
+        run: |
+          current=$(grep -oP '__version__ = "\K[^"]+' unshackle/core/__init__.py)
+          prev=$(git show HEAD^:unshackle/core/__init__.py \
+                 | grep -oP '__version__ = "\K[^"]+' || echo '')
+          echo "version=$current"   >>"$GITHUB_OUTPUT"
+          echo "changed=$([ "$current" != "$prev" ] && echo true || echo false)" >>"$GITHUB_OUTPUT"
+          echo "Current=$current  Previous=$prev"
+
+  build-and-push:
+    needs: detect-version-change
+    if: needs.detect-version-change.outputs.changed == 'true' # only run when bumped :contentReference[oaicite:2]{index=2}
+    runs-on: ubuntu-latest
+    permissions: { contents: read, packages: write }
 
     steps:
       - name: Checkout repository

README.md

@@ -41,11 +41,57 @@ uv tool install git+https://github.com/unshackle-dl/unshackle.git
 uvx unshackle --help   # or just `unshackle` once PATH updated
 ```
 
+### Docker Installation
+
+Run unshackle using our pre-built Docker image from GitHub Container Registry:
+
+```bash
+# Run with default help command
+docker run --rm ghcr.io/unshackle-dl/unshackle:latest
+
+# Check environment dependencies
+docker run --rm ghcr.io/unshackle-dl/unshackle:latest env check
+
+# Download content (mount directories for persistent data)
+docker run --rm \
+  -v "$(pwd)/downloads:/downloads" \
+  -v "$(pwd)/unshackle/cookies:/app/unshackle/cookies" \
+  -v "$(pwd)/unshackle/services:/app/unshackle/services" \
+  -v "$(pwd)/unshackle.yaml:/app/unshackle.yaml" \
+  ghcr.io/unshackle-dl/unshackle:latest dl SERVICE_NAME CONTENT_ID
+
+# Run interactively for configuration
+docker run --rm -it \
+  -v "$(pwd)/unshackle/cookies:/app/unshackle/cookies" \
+  -v "$(pwd)/unshackle/services:/app/unshackle/services" \
+  -v "$(pwd)/unshackle.yaml:/app/unshackle.yaml" \
+  ghcr.io/unshackle-dl/unshackle:latest cfg
+```
+
+**Alternative: Build locally**
+
+```bash
+# Clone and build your own image
+git clone https://github.com/unshackle-dl/unshackle.git
+cd unshackle
+docker build -t unshackle .
+docker run --rm unshackle env check
+```
+
 > [!NOTE]
 > After installation, you may need to add the installation path to your PATH environment variable if prompted.
 
 > **Recommended:** Use `uv run unshackle` instead of direct command execution to ensure proper virtual environment activation.
 
+## Planned Features
+
+- 🌈 **HDR10+DV Hybrid Support** - Allow support for hybrid HDR10+ and Dolby Vision.
+- 🖥️ **Web UI Access & Control** - Manage and control unshackle from a modern web interface.
+- 🔄 **Sonarr/Radarr Interactivity** - Direct integration for automated personal downloads.
+- ⚙️ **Better ISM Support** - Improve on ISM support for multiple services
+- 🔉 **ATMOS** - Better Atmos Support/Selection
+- 🎵 **Music** - Cleanup Audio Tagging using the [tags.py](unshackle/core/utils/tags.py) for artist/track name etc.
+
 ### Basic Usage
 
 ```shell
@@ -53,25 +99,15 @@ uvx unshackle --help   # or just `unshackle` once PATH updated
 uv run unshackle --help
 
 # Configure your settings
-uv run unshackle cfg --help
-
-# Confirm setup and all dependencies exist
-uv run automaterr env check
+git clone https://github.com/unshackle-dl/unshackle.git
+cd unshackle
+uv sync
+uv run unshackle --help
 
 # Download content (requires configured services)
 uv run unshackle dl SERVICE_NAME CONTENT_ID
 ```
 
-## Planned Features
-
-- 🌈 **HDR10+DV Hybrid Support** - Allow support for hybrid HDR10+ and Dolby Vision.
-- 🖥️ **Web UI Access & Control** - Manage and control unshackle from a modern web interface.
-- 🔄 **Sonarr/Radarr Interactivity** - Direct integration for automated personal downloads.
-- ⚙️ **Better ISM Support** - Improve on ISM support for multiple services
-- 🐳 **Docker Image** - Prepared Docker Image with everything ready to go.
-- 🔉 **ATMOS** - Better Atmos Support/Selection
-- 🎵 **Music** - Cleanup Audio Tagging using the [tags.py](unshackle/core/utils/tags.py) for artist/track name etc.
-
 ## Documentation
 
 For comprehensive setup guides, configuration options, and advanced usage: