add missing extensions to images #577

Job	Run time
buildx (pantheon-index, 3.6-3, dockerfiles/3.6-solr)	22s
buildx (pantheon-index, 8.8-4, dockerfiles/8.8-solr)	22s
buildx (pantheon-appserver, 8.3-4, dockerfiles/8.3-fpm)	23s
buildx (pantheon-appserver, 8.2-4, dockerfiles/8.2-fpm)	22s
buildx (pantheon-appserver, 8.1-4, dockerfiles/8.1-fpm)	20s
buildx (pantheon-appserver, 8.0-4, dockerfiles/8.0-fpm)	21s
buildx (pantheon-appserver, 7.4-4, dockerfiles/7.4-fpm)	21s
buildx (pantheon-appserver, 7.3-4, dockerfiles/7.3-fpm)	20s
buildx (pantheon-appserver, 7.2-4, dockerfiles/7.2-fpm)	25s
buildx (pantheon-appserver, 7.1-4, dockerfiles/7.1-fpm)	25s
buildx (pantheon-appserver, 7.0-4, dockerfiles/7.0-fpm)	25s
buildx (pantheon-appserver, 5.6-4, dockerfiles/5.6-fpm)	25s
	4m 31s

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