Add debugging statements to figure where the CI workflow is erroring

.github/workflows/stack_size.yml

@@ -54,6 +54,8 @@ jobs:
             sha256sum $bin
           done
 
+          echo "Verifying artifacts are equivalent"
+
           sha256() {
             sha256sum "$1" | cut -d' ' -f1
           }
@@ -66,6 +68,8 @@ jobs:
             fi
           done
 
+          echo "Verified artifacts are equivalent"
+
           read_stack() {
             STACK_INFO=$(readelf "$1" -l | grep STACK -A1)
             MEMSZ=$(echo "$STACK_INFO" | tail -n1 | sed -E s/^[[:space:]]*//g | cut -f2 -d' ')
@@ -77,15 +81,21 @@ jobs:
             exit 2
           fi
 
+          echo "Verified \`read_stack\` agrees the binary started with 0"
+
           UPDATED_STACK=$(read_stack monerod-chelf)
           if [ "$UPDATED_STACK" -ne "$STACK" ]; then
             echo "Updated \`PT_GNU_STACK\` ($UPDATED_STACK) wasn't 8 MB ($STACK)"
             exit 3
           fi
 
+          echo "Verified \`read_stack\` agrees the binary's stack is now 8 MB"
+
           # Only one byte should be different due to the bit pattern of 8 MB
           BYTES_DIFFERENT=$(cmp -l monerod monerod-chelf | wc -l)
           if [ "$BYTES_DIFFERENT" -ne 1 ]; then
             echo "More than one byte was different between the two binaries"
             exit 4
           fi
+
+          echo "Verified only a single byte is different between the two binaries"