Fix check-supported-tools-tables check

sed wasn't using -E, so '|' wasn't being handled properly. Seems likely
that's sed-implementation specific, so now it runs through docker's sed
to support portability.

test/script/check-supported-tools-tables

@@ -22,7 +22,7 @@ done < <(
     grep '^\*\|^  *\*' doc/ale-supported-languages-and-tools.txt \
     | sed -e '1,2d' \
     | sed 's/^\* */!/' \
-    | sed 's/^ *\* *\|!!\|\^\|(.*)\|`//g' \
+    | sed -E 's/^ *\* *|!!|\^|(.*)|`//g' \
     | sed 's/ *$//'
 ) > "$doc_file"
 
@@ -36,7 +36,7 @@ while read -r; do
 done < <(
     grep '^\*\|^  *\*' supported-tools.md \
     | sed 's/^\* */!/' \
-    | sed 's/^ *\* *\|:floppy_disk:\|:warning:\|(.*)\|\[\|\].*\|-n flag//g' \
+    | sed -E 's/^ *\* *|:floppy_disk:|:warning:|\(.*\)|\[|\].*|-n flag//g' \
     | sed 's/ *$//'
 ) > "$readme_file"
 

test/script/custom-checks

@@ -46,7 +46,9 @@ echo '========================================'
 echo 'Differences follow:'
 echo
 
-test/script/check-supported-tools-tables || exit_code=$?
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-supported-tools-tables || exit_code=$?
+set +o pipefail
 
 echo '========================================'
 echo 'Look for badly aligned doc tags'