apply flag to catch bash error to all bash loops in makefile

Author: jeffjennings

Makefile

@@ -22,7 +22,11 @@ init:
 build: convert
 buildall: convertall
 
+# 'set -e' is used to cause the bash loop to immediately exit on a failure.
+# without this, the github actions workflow can succeed even if commands in these
+# bash loops (installing packages, executing notebooks, converting notebooks) fail
 execute:
+	set -e; \
 	i=0; \
 	_paths=($(MODIFIED_RQT_PATHS)); \
 	for notebook in ${MODIFIED_NOTEBOOKS}; do \
@@ -44,6 +48,7 @@ convert:
 	done
 
 executeall:
+	set -e; \
 	i=0; \
 	_paths=(${ALL_RQT_PATHS}); \
 	for notebook in ${ALL_NOTEBOOKS}; do \
@@ -54,6 +59,7 @@ executeall:
 	done
 
 convertall:
+	set -e; \
 	i=0; \
 	_paths=($(ALL_RQT_PATHS)); \
 	for notebook in ${ALL_NOTEBOOKS}; do \