Set the image name in the release ci workflow

I tried to be clever and get it from the github context, but I
don't want the '-docker' at the end of the repository name.

.github/workflows/release.yml

@@ -6,6 +6,9 @@ on:
       - 'v[0-9]+.[0-9]+.[0-9]+'
       - '!v[0-9]+.[0-9]+.[0-9]+[ab][0-9]+'
 
+env:
+  REPO: csdms/bmi-example-python
+
 jobs:
 
   build-and-push:
@@ -32,4 +35,4 @@ jobs:
         with:
           platforms: linux/amd64,linux/arm64
           push: true
-          tags: ${{ github.repository }}:latest,${{ github.repository }}:${{ steps.vars.outputs.version }}
+          tags: ${REPO}:latest,${REPO}:${{ steps.vars.outputs.version }}

README.md

@@ -51,7 +51,7 @@ Copy/paste this URL into a browser to view and run the example notebooks.
 ## Developer notes
 
 A versioned, multiplatform image built from this repository is hosted on Docker Hub
-at [csdms/bmi-example-python](https://hub.docker.com/repository/docker/csdms/bmi-example-python-docker/).
+at [csdms/bmi-example-python](https://hub.docker.com/repository/docker/csdms/bmi-example-python/).
 This image is automatically built and pushed to Docker Hub
 with the [release](./.github/workflows/release.yml) CI workflow.
 The workflow is only run when the repository is tagged.