- Make jobs run on latest versions of the OS's (except for
"Checks", which relies on specific versions of checkers coming
with Ubuntu 18.04)
- Bump actions/checkout to v2
- Rewrite `apt-get` to `apt` (almost the same, but `apt` is the
2nd gen tool)
- Drop step names (they took too much vertical space, didn't add
too much useful information, and were very typo-prone)
- Move superfluous environment variables (e.g., `BUILD_OPTIONS` or
`SKIP_LIST`) to their expansion sites (use YAML block scalars
`>-` where appropriate to enhance readability)
- Fix duplicate installation of pylint in the "Checks" job
JerryScript-DCO-1.0-Signed-off-by: Akos Kiss [email protected]