Improve readability of build scan when requested tasks is very long, as
agreed in #175. HTML diff for each case of job summary is clearer in
cd62d9c9efc15c90df77242059b98bdaa4f39a43.
- Ensure a minimum size for the badge, at least the size of "Build
scan®", by preventing a line break with ` `
- Reduce the size of the badge by tweaking the inner text
Also fix a typo in the build shell script.
bce7daca54