Hard fail if a step in the docker build fails.

build_and_push_docker

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Stop immediately on any error so a failed build never gets tagged or pushed
+set -euo pipefail
+
 # Extract version from version.py
 if [ -f "version.py" ]; then
     VERSION=$(python3 -c "from version import VERSION; print(VERSION)")