Add tzdata package for timezones #313

Job	Run time
Get changed Dockerfiles	8s
Test build (silta-nginx/1.17/Dockerfile)	21s
Test build (silta-nginx/1.19/Dockerfile)	23s
Test build (silta-nginx/1.21/Dockerfile)	24s
Test build (silta-nginx/1.23/Dockerfile)	23s
Test build (silta-nginx/1.24/Dockerfile)	26s
Test build (silta-node/12-alpine/Dockerfile)	9s
Test build (silta-node/14-alpine/Dockerfile)	7s
Test build (silta-node/16-alpine/Dockerfile)	7s
Test build (silta-node/18-alpine/Dockerfile)	11s
Test build (silta-node/20-alpine/Dockerfile)	11s
Test build (silta-php-fpm/7.2-fpm/Dockerfile)	1m 50s
Test build (silta-php-fpm/7.3-fpm/Dockerfile)	2m 29s
Test build (silta-php-fpm/7.4-fpm/Dockerfile)	2m 56s
Test build (silta-php-fpm/8.0-fpm/Dockerfile)	3m 6s
Test build (silta-php-fpm/8.1-fpm/Dockerfile)	2m 34s
Test build (silta-php-fpm/8.2-fpm/Dockerfile)	2m 44s
	18m 29s

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