Replace hardcoded org name by ${GITHUB_REPOSITORY_OWNER} (#333) (#349) #56

Job	Run time
Build and push base pyrust	2m 45s
Build and push base pyrust	2m 45s
Build and push base postgres image	1m 41s
Build and push base postgres image	1m 31s
Build and push base postgres with pgstac installed	1m 33s
Build and push base postgres with pgstac installed	1m 33s
Build and push base pyrust	2m 38s
Build and push base pyrust	2m 38s
Release	50s
Release	50s
tag	5s
tag	5s
	18m 54s

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