Use GHA to build image on tagged release

Author: mdpiper

.github/workflows/release.yml

@@ -0,0 +1,38 @@
+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/jupyterhub
+
+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 }}