add environment variable RETICULATE_PYTHON #131

Job	Run time
docker (base, anonymization/Dockerfile, anonymization)	2m 30s
docker (base-apps, apps/Dockerfile, apps)	2m 22s
docker (inception-minio, inception/inception-minio/Dockerfile, inception/inception-minio)	28s
docker (inception-minio-mariadb, inception/inception-minio-mariadb/Dockerfile, inception/inceptio...	59s
docker (shinyproxy, shinyproxy/Dockerfile, shinyproxy)	22s
docker (rstudio, development/rstudio/Dockerfile, development/rstudio)	1m 34s
docker (prefect-example, development/test/prefectexample/Dockerfile, development/test/prefectexam...	33s
docker (prefect-inspect, development/test/prefectinspect/Dockerfile, development/test/prefectinsp...	23s
	9m 11s

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