docs: github and dockerhub readmes

Author: grthomson

.github/workflows/main.yml

@@ -28,3 +28,11 @@ jobs:
           context: .
           push: true
           tags: ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }}:latest
+
+      - name: Update Docker Hub description
+        uses: crazy-max/ghaction-dockerhub-description@v4
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: grthomson/docker-rust-postgres
+          readme-filepath: README.Docker.md

README.Docker.md

@@ -1,22 +1,18 @@
-### Building and running your application
+# grthomson/docker-rust-postgres
 
-When you're ready, start your application by running:
-`docker compose up --build`.
+Minimal Rust + PostgreSQL service (Actix Web).
 
-Your application will be available at http://localhost:8000.
+## Usage
+```bash
+docker pull grthomson/docker-rust-postgres:latest
+docker run -p 8000:8000 \
+  -e PG_HOST=host.docker.internal \
+  -e PG_DBNAME=example \
+  -e PG_USER=postgres \
+  -e PG_PASSWORD=mysecretpassword \
+  grthomson/docker-rust-postgres:latest
+  ```
 
-### Deploying your application to the cloud
+## Endpoints
 
-First, build your image, e.g.: `docker build -t myapp .`.
-If your cloud uses a different CPU architecture than your development
-machine (e.g., you are on a Mac M1 and your cloud provider is amd64),
-you'll want to build the image for that platform, e.g.:
-`docker build --platform=linux/amd64 -t myapp .`.
-
-Then, push it to your registry, e.g. `docker push myregistry.com/myapp`.
-
-Consult Docker's [getting started](https://docs.docker.com/go/get-started-sharing/)
-docs for more detail on building and pushing.
-
-### References
-* [Docker's Rust guide](https://docs.docker.com/language/rust/)
+```GET /users```, ```GET /healthz```