feat: update docker and pipeline

- Add workflow to publish to GHCR
- Add workflow to build Docker image
- Add zap2xmlrc config example
- Update Dockerfile to run continuously

README.md

@@ -0,0 +1,29 @@
+# zap2xml
+
+See [zap2xml](https://web.archive.org/web/20200426004001/zap2xml.awardspace.info/) for original Perl script and guidance for the configuration file.
+
+## Docker
+
+| Tag | Description |
+|---|---|
+| latest | Stable zap2xml releases |
+| nightly | HEAD zap2xml release |
+
+### Compose
+
+```yaml
+version: '3'
+services:
+  zap2xml:
+    container_name: zap2xml
+    image: ghcr.io/jef/zap2xml:latest
+    environment:
+      OPT_ARGS: >-
+        -I -D -C /config/.zap2xmlrc
+      SLEEPTIME: 43200 # 12 hours in seconds
+      TZ: America/New_York
+    volumes:
+      - /path/to/appdata/zap2xml:/config
+      - /path/to/appdata/xmltv:/xmltv # nice for mapping other drives to this that may use xmltv.xml
+    restart: unless-stopped
+```