* ci: re-enable browserstack tests ...
- Also sets "strict mode" bash with -euo pipefail at executor level.
* ci: Makefile: more compatible SHELL var
* ci: remove some trailing whitespace
* ci: remove redundant set -eux -o pipefail
- In some cases, just replace with -x where debug output might be useful.
- In most cases, don't bother with -x, it is a secret leak risk, and
circleci prints the command body before executing it anyway.
* try specifying yarn version
* set yarn version
* Revert "try specifying yarn version"
This reverts commit 6b4e57a304d999d72d4b07468a6b4a30880f1f4c.
