Only perform one release at a time

.github/workflows/release.yml

@@ -1,4 +1,4 @@
-name: Publish Docker Image
+name: Release Docker Image
 
 # This workflow uses actions that are not certified by GitHub.
 # They are provided by a third-party and are governed by
@@ -27,6 +27,11 @@ jobs:
             # with sigstore/fulcio when running outside of PRs.
             id-token: write
 
+        # Only one release at a time and cancel prior releases
+        concurrency:
+            group: release
+            cancel-in-progress: true
+
         steps:
             - name: Checkout repository
               uses: actions/checkout@v3