GitHub Actions runner added (#6) #51

Job	Run time
Docker	1m 19s
Linters (8.1)	49s
Phar (8.1)	37s
Linters (8.2)	57s
PHPUnit (8.1, xdebug, --prefer-lowest)	37s
Phar (8.2)	30s
Linters (8.3)	48s
Reports (8.1)	28s
PHPUnit (8.1, xdebug)	56s
Phar (8.3)	29s
PHPUnit (8.1, none, --prefer-lowest)	24s
Reports (8.2)	43s
Reports (8.3)	49s
PHPUnit (8.1, none)	39s
PHPUnit (8.2, xdebug, --prefer-lowest)	35s
PHPUnit (8.2, xdebug)	30s
PHPUnit (8.2, none, --prefer-lowest)	25s
PHPUnit (8.2, none)	33s
PHPUnit (8.3, xdebug, --prefer-lowest)	48s
PHPUnit (8.3, xdebug)	30s
PHPUnit (8.3, none, --prefer-lowest)	30s
PHPUnit (8.3, none)	24s
	14m 20s

Provide feedback