Use env context for repo variable #3

	name: Docker Hub

	on:
	push:
	tags:
	- '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:
	runs-on: ubuntu-latest

	steps:
	- name: Get version
	id: vars
	run: echo "version=${GITHUB_REF:11}" >> $GITHUB_OUTPUT

	- name: Set up Docker buildx
	uses: docker/setup-buildx-action@v3
	with:
	platforms: linux/amd64,linux/arm64

	- name: Login to Docker Hub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64,linux/arm64
	push: true
	tags: ${{ env.REPO }}:latest,${{ env.REPO }}:${{ steps.vars.outputs.version }}

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