Build and test Docket image (#4) #43

Job	Run time
Docker	1m 13s
Linters (8.1)	44s
Linters (8.2)	51s
Phar (8.1)	39s
Linters (8.3)	46s
Phar (8.2)	30s
PHPUnit (8.1, xdebug, --prefer-lowest)	42s
Phar (8.3)	37s
PHPUnit (8.1, xdebug)	31s
Reports (8.1)	48s
PHPUnit (8.1, none, --prefer-lowest)	24s
Reports (8.2)	49s
PHPUnit (8.1, none)	24s
Reports (8.3)	45s
PHPUnit (8.2, xdebug, --prefer-lowest)	31s
PHPUnit (8.2, xdebug)	31s
PHPUnit (8.2, none, --prefer-lowest)	29s
PHPUnit (8.2, none)	25s
PHPUnit (8.3, xdebug, --prefer-lowest)	34s
PHPUnit (8.3, xdebug)	51s
PHPUnit (8.3, none, --prefer-lowest)	29s
PHPUnit (8.3, none)	23s
	13m 56s

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