version dockerhub readme and update it automatically on release

.github/workflows/dockerhub.yml

@@ -0,0 +1,18 @@
+name: Update Docker Hub Description
+
+on: release
+
+jobs:
+  dockerHubDescription:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docker Hub Description
+        uses: peter-evans/dockerhub-description@v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: athou/commafeed
+          short-description: ${{ github.event.repository.description }}
+          readme-filepath: commafeed-server/src/main/docker/README.md

README.md

@@ -105,7 +105,6 @@ meaning that you will have to log back in after each restart of the application.
 
 All [CommaFeed settings](commafeed-server/src/main/java/com/commafeed/CommaFeedConfiguration.java)
 are optional and have sensible default values.
-Other Quarkus settings can be found [here](https://quarkus.io/guides/all-config).
 
 When started, the server will listen on http://localhost:8082.
 The default user is `admin` and the default password is `admin`.

commafeed-server/src/main/docker/README.md

@@ -0,0 +1,86 @@
+# CommaFeed
+
+Official docker images for https://github.com/Athou/commafeed/
+
+## Quickstart
+
+Start CommaFeed with an embedded database. Then login as `admin/admin` on http://localhost:8082/
+
+### docker
+
+`docker run --name commafeed --detach --publish 8082:8082 --restart unless-stopped --volume /path/to/commafeed/db:/commafeed/data --memory 256M athou/commafeed:latest-h2`
+
+### docker-compose
+
+```
+services:
+  commafeed:
+    image: athou/commafeed:latest-h2
+    restart: unless-stopped
+    volumes:
+      - /path/to/commafeed/db:/commafeed/data
+    deploy:
+      resources:
+        limits:
+          memory: 256M
+    ports:
+      - 8082:8082
+```
+
+## Advanced
+
+While using the embedded database is perfectly fine for small instances, you may want to have more control over the
+database. Here's an example that uses postgresql (note the different docker tag):
+
+```
+services:
+  commafeed:
+    image: athou/commafeed:latest-postgresql
+    restart: unless-stopped
+    environment:
+      - QUARKUS_DATASOURCE_JDBC_URL=jdbc:postgresql://postgresql:5432/commafeed
+      - QUARKUS_DATASOURCE_USERNAME=commafeed
+      - QUARKUS_DATASOURCE_PASSWORD=commafeed
+    deploy:
+      resources:
+        limits:
+          memory: 256M
+    ports:
+      - 8082:8082
+
+  postgresql:
+    image: postgres:latest
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: commafeed
+      POSTGRES_PASSWORD: commafeed
+      POSTGRES_DB: commafeed
+    volumes:
+      - /path/to/commafeed/db:/var/lib/postgresql/data
+```
+
+## Configuration
+
+All [CommaFeed settings](https://github.com/Athou/commafeed/blob/master/commafeed-server/src/main/java/com/commafeed/CommaFeedConfiguration.java)
+are optional and have sensible default values.
+
+Settings are overrideable with environment variables. For instance, `config.feedRefresh().intervalEmpirical()` can be
+set
+with the `COMMAFEED_FEED_REFRESH_INTERVAL_EMPIRICAL=true` variable.
+
+When logging in, credentials are stored in an encrypted cookie. The encryption key is randomly generated at startup,
+meaning that you will have to log back in after each restart of the application. To prevent this, you can set the
+`QUARKUS_HTTP_AUTH_SESSION_ENCRYPTION_KEY` property to a fixed value (min. 16 characters).
+
+## Docker tags
+
+Tags are of the form `<version>-<database>[-jvm]` where:
+
+- `<version>` is either:
+    - a specific CommaFeed version (e.g. `4.6.0`)
+    - `latest` (always points to the latest version)
+    - `master` (always points to the latest git commit)
+- `<database>` is the database to use (`h2`, `postgresql`, `mysql` or `mariadb`)
+- `-jvm` is optional and indicates that CommaFeed is running on a JVM, and not compiled natively. This image supports
+  the
+  arm64 platform which is not yet supported by the native image.